The Messenger of Allah ﷺ used to attack the enemy when it was dawn. He would listen to the Adhan; so if he heard an Adhan, he stopped, otherwise made an attack. Once on hearing a man say: Allah is the Greatest, Allah is the Greatest, the Messenger of Allah ﷺ remarked: He is following al-Fitra (al-Islam). Then hearing him say: I testify that there is no god but Allah. there is no god but Allah, the Messenger of Allah ﷺ said: You have come out of the Fire (of Hell). They looked at him and found that he was a goat herd.  

كَانَ رَسُولُ اللَّهِ ﷺ يُغِيرُ إِذَا طَلَعَ الْفَجْرُ وَكَانَ يَسْتَمِعُ الأَذَانَ فَإِنْ سَمِعَ أَذَانًا أَمْسَكَ وَإِلاَّ أَغَارَ فَسَمِعَ رَجُلاً يَقُولُ اللَّهُ أَكْبَرُ اللَّهُ أَكْبَرُ فَقَالَ رَسُولُ اللَّهِ ﷺ عَلَى الْفِطْرَةِ ثُمَّ قَالَ أَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ أَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ فَقَالَ رَسُولُ اللَّهِ ﷺ خَرَجْتَ مِنَ النَّارِ فَنَظَرُوا فَإِذَا هُوَ رَاعِي مِعْزًى  

That the Prophet ﷺ would not attack except near the time of Fajr, so if he heard the Adhan he would refrain, and if not, then he would attack. So he listened one day and heard a man saying: "Allahu Akbar, Allahu Akbar," so he said: "Upon the Fitrah." Then he said: "I bear witness that none has the right to be worshipped but Allah." So he said: "You have departed from the Fire."  

كَانَ النَّبِيُّ ﷺ لاَ يُغِيرُ إِلاَّ عِنْدَ صَلاَةِ الْفَجْرِ فَإِنْ سَمِعَ أَذَانًا أَمْسَكَ وَإِلاَّ أَغَارَ فَاسْتَمَعَ ذَاتَ يَوْمٍ فَسَمِعَ رَجُلاً يَقُولُ اللَّهُ أَكْبَرُ اللَّهُ أَكْبَرُ فَقَالَ عَلَى الْفِطْرَةِ فَقَالَ أَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ فَقَالَ خَرَجْتَ مِنَ النَّارِ  

That the Prophet ﷺ would not attack except near the time of Fajr, so if he heard the Adhan he would refrain, and if not, then he would attack. So he listened one day and heard a man saying: "Allahu Akbar, Allahu Akbar," so he said: "Upon the Fitrah." Then he said: "I bear witness that none has the right to be worshipped but Allah." So he said: "You have departed from the Fire." (Using translation from Tirmidhī 1618)   

أَنَّ رَسُولَ اللهِ ﷺ كَانَ يُغِيرُ عِنْدَ صَلَاةِ الْفَجْرِ فَيَسْتَمِعُ الْأَذَانَ فَإِذَا سَمِعَ الْأَذَانَ أَمْسَكَ وَإِلَّا أَغَارَ فَاسْتَمَعَ ذَاتَ يَوْمٍ فَسَمِعَ رَجُلًا يَقُولُ اللهُ أَكْبَرُ اللهُ أَكْبَرُ فَقَالَ رَسُولُ اللهِ ﷺ عَلَى الْفِطْرَةِ فَقَالَ أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللهُ فَقَالَ خَرَجْتَ مِنَ النَّارِ  

[Machine] "The Messenger of Allah ﷺ heard a man saying 'Allahu Akbar, Allahu Akbar' (Allah is the greatest, Allah is the greatest). He said, 'Upon Fitrah (natural inclination).' Then he said, 'I testify that there is no deity worthy of worship except Allah, I testify that there is no deity worthy of worship except Allah.' Then he said, 'Have you come out from the Fire.'"  

أَنَّ رَسُولَ اللهِ ﷺ سَمِعَ رَجُلًا يَقُولُ اللهُ أَكْبَرُ اللهُ أَكْبَرُ قَالَ عَلَى الْفِطْرَةِ فَقَالَ أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللهُ أَشْهَدُأَنْ لَا إِلَهَ إِلَّا اللهُ فَقَالَ خَرَجْتَ مِنَ النَّارِ  

[Machine] "While we were with the Messenger of Allah ﷺ during one of his journeys, we heard a caller calling, 'Allahu Akbar, Allahu Akbar.' The Prophet of Allah ﷺ said, 'By instinct, I testify that there is no deity worthy of worship except Allah.' The Prophet of Allah ﷺ said (afterwards), 'He came out of the Fire.' Then we pursued him and found him to be a man with a walking stick. Prayer caught up with him, and he called out the adhan."  

بَيْنَمَا نَحْنُ مَعَ رَسُولِ اللهِ ﷺ فِي بَعْضِ أَسْفَارِهِ سَمِعْنَا مُنَادِيًا يُنَادِي اللهُ أَكْبَرُ اللهُ أَكْبَرُ فَقَالَ نَبِيُّ اللهِ ﷺ عَلَى الْفِطْرَةِ فَقَالَ أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللهُ فَقَالَ نَبِيُّ اللهِ ﷺ خَرَجَ مِنَ النَّارِ قَالَ فَابْتَدَرْنَاهُ فَإِذَا هُوَ صَاحِبُ مَاشِيَةٍ أَدْرَكَتْهُ الصَّلَاةُ فَنَادَى بِهَا  

[Machine] While the Messenger of Allah ﷺ was on one of his journeys, he heard a caller saying "Allahu Akbar, Allahu Akbar." So he said, according to his natural disposition, "I bear witness that there is no god but Allah." Then he said, "I bear witness that Muhammad is the Messenger of Allah." He said, "He who testifies to the truth will be saved from the Fire. Look, you will find him either as a shepherd who is oppressed or as a dog with distemper." So they looked and found him as a shepherd. Prayer approached, so he called for it.  

بَيْنَمَا رَسُولُ اللهِ ﷺ فِي بَعْضِ أَسْفَارِهِ إِذْ سَمِعَمُنَادِيًا يَقُولُ اللهُ أَكْبَرُ اللهُ أَكْبَرُ فَقَالَ عَلَى الْفِطْرَةِ فَقَالَ أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللهُ فَقَالَ شَهِدَ بِشَهَادَةِ الْحَقِّ قَالَ أَشْهَدُ أَنَّ مُحَمَّدًا رَسُولُ اللهِ قَالَ خَرَجَ مِنَ النَّارِ انْظُرُوا فَسَتَجِدُونَهُ إِمَّا رَاعِيًا مُعْزِبًا وَإِمَّا مُكَلِّبًا فَنَظَرُوهُ فَوَجَدُوهُ رَاعِيًا حَضَرَتْهُ الصَّلَاةُ فَنَادَى بِهَا  

[Machine] The Messenger of Allah ﷺ heard a man while he was walking and saying "Allah is the Greatest, Allah is the Greatest". The Prophet ﷺ said, "According to our innate nature (Fitrah)". Then he said, "I bear witness that there is no god but Allah" and the Messenger of Allah ﷺ said, "He is forbidden from Hell". So we rushed to catch up with him, and when the prayer reached him, he called out with it.  

سَمِعَ رَسُولُ اللَّهِ ﷺ رَجُلًا وَهُوَ فِي مَسِيرٍ لَهُ يَقُولُ اللَّهُ أَكْبَرُ اللَّهُ أَكْبَرُ فَقَالَ نَبِيُّ اللَّهِ ﷺ «عَلَى الْفِطْرَةِ» ثُمَّ قَالَ أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللَّهُ فَقَالَ رَسُولُ اللَّهِ ﷺ «حُرِّمَ عَلَى النَّارِ» فَابْتَدَرْنَاهُ فَإِذَا هُوَ صَاحِبُ مَاشِيَةٍ أَدْرَكَتْهُ الصَّلَاةُ فَنَادَى بِهَا  

[Machine] While we were with the Prophet ﷺ , we heard a caller calling out "Allahu Akbar, Allahu Akbar" (God is the greatest, God is the greatest). The Prophet ﷺ said, "According to the fitrah (natural disposition)." Then he said, "I bear witness that there is no God but Allah." He said, "He who says it will be saved from hellfire." Then we hurriedly went to a shepherd in the wilderness. Prayer then approached, so the caller proclaimed it.  

بَيْنَمَا نَحْنُ مَعَ النَّبِيِّ ﷺ إِذْ سَمِعْنَا مُنَادِيًا يُنَادِي اللهُ أَكْبَرُ اللهُ أَكْبَرُ فَقَالَ النَّبِيُّ ﷺ «عَلَى الْفِطْرَةِ» ثُمَّ قَالَ أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللهُ قَالَ «خَرَجَ بِهَا مِنَ النَّارِ» فَابْتَدَرْنَا فَإِذَا رَاعٍ فِي شَاءٍ لَهُ فَحَضَرَتْهُ الصَّلَاةُ فَنَادَى بِهَا  

[Machine] While the Messenger of Allah ﷺ was on one of his journeys, he heard a caller saying, "Allah is the Greatest, Allah is the Greatest." The Messenger of Allah ﷺ said, "Upon Fitrah (natural disposition)." Then he said, "I bear witness that there is no god but Allah." The Messenger of Allah ﷺ said, "He has come out of the Fire."  

بَيْنَمَا رَسُولُ اللهِ ﷺ فِي بَعْضِ أَسْفَارِهِ إِذْ سَمِعَ مُنَادِيًا يَقُولُ اللهُ أَكْبَرُ اللهُ أَكْبَرُ فَقَالَ رَسُولُ اللهِ ﷺ «عَلَى الْفِطْرَةِ» فَقَالَ أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللهُ فَقَالَ رَسُولُ اللهِ ﷺ «خَرَجَ مِنَ النَّارِ»  

[Machine] While we were with the Messenger of Allah ﷺ , a man called the Adhan (Muslim call to prayer). The Prophet ﷺ said, "According to the Fitrah (natural disposition)." The man then said, "I testify that there is no god but Allah," so the Prophet ﷺ said, "He has testified to the truth." Then the man said, "I testify that Muhammad is the Messenger of Allah," to which the Prophet ﷺ said, "He has been saved from the Fire."  

بَيْنَا نَحْنُ عِنْدَ رَسُولِ اللهِ ﷺ إِذْ سَمِعَ رَجُلًا يُؤَذِّنُ فَقَالَ النَّبِيُّ ﷺ «عَلَى الْفِطْرَةِ» فَقَالَ أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللهُ فَقَالَ «شَهِدَ بِالْحَقِّ» قَالَ أَشْهَدُ أَنَّ مُحَمَّدًا رَسُولُ اللهِ قَالَ «خَرَجَ مِنَ النَّارِ»  

[Machine] The Prophet ﷺ was on a journey when he heard someone saying "Allah is the Greatest, Allah is the Greatest." The Prophet ﷺ said, "The call of truth." Then the person said, "I bear witness that there is no deity but Allah," and the Prophet ﷺ said, "The word of sincerity." Then the person said, "I bear witness that Muhammad is the Messenger of Allah," and the Prophet ﷺ said, "Its companion has been saved from the Hellfire." Then the Prophet ﷺ said, "You will find this person with either a company of comfortable people or with a company of hunting dogs."  

كَانَ النَّبِيُّ ﷺ فِي مَسِيرٍ فَسَمِعَ قَائِلًا يَقُولُ اللهُ أَكْبَرُ اللهُ أَكْبَرُ فَقَالَ النَّبِيُّ ﷺ «دَعْوَةُ الْحَقِّ» فَقَالَ أَشْهَدُ أَنَّ لَا إِلَهَ إِلَّا اللهُ فَقَالَ النَّبِيُّ ﷺ «كَلِمَةُ الْإِخْلَاصِ» فَقَالَ أَشْهَدُ أَنَّ مُحَمَّدًا رَسُولُ اللهِ فَقَالَ النَّبِيُّ ﷺ «خَرَجَ صَاحِبُهَا مِنَ النَّارِ» ثُمَّ قَالَ النَّبِيُّ ﷺ «تَجِدُونَ هَذَا صَاحِبَ مِعْزًى أَوْ صَاحِبَ كِلَابٍ يَتَصَيَّدُ»  

[Machine] While we were with the Messenger of Allah ﷺ during one of his journeys, we heard someone calling out, "Allah is the Greatest, Allah is the Greatest." So the Messenger of Allah ﷺ said, "Upon Fitrah (natural disposition), he said, 'I bear witness that there is no god but Allah.'" The Messenger of Allah ﷺ then said, 'He has escaped from the fire.' Then we intercepted him, and when the time for prayer arrived, he offered it and called out with it.  

بَيْنَمَا نَحْنُ مَعَ رَسُولِ اللهِ ﷺ فِي بَعْضِ أَسْفَارِهِ إِذْ سَمِعْنَا مُنَادِيًا يَقُولُ اللهُ أَكْبَرُ اللهُ أَكْبَرُ فَقَالَ رَسُولُ اللهِ ﷺ عَلَى الْفِطْرَةِ فَقَالَ أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللهُ فَقَالَ رَسُولُ اللهِ ﷺ خَرَجَ مِنَ النَّارِ قَالَ فَابْتَدَرْنَاهُ فَإِذَا صَاحِبُ مَاشِيَةٍ أَدْرَكَتْهُ الصَّلَاةُ فَنَادَى بِهَا  

"سَمِعَ النبِيُّ ﷺ رَجُلًا وَهُوَ فِى مَسِيرٍ لَهُ يَقُولُ: أكْبَرُ الله أكْبَرُ الله. فَقَالَ: عَلَى الفِطرَةِ، فَقَالَ: اشْهَدُ أنْ لاَ إِلَهَ إِلَّا الله فَقَالَ: خَرَجَ مِنَ النَّارِ، فَاسْتَبَقَ القَوْمُ إِلَى الرَّجُلِ فإِذَا رَاعِى غَنَمٍ حَضَرَتِ الصَّلاَةُ فَقَامَ يُؤَذنُ ".