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. (Using translation from Muslim 382)   

كَانَ رَسُولُ اللهِ ﷺ يُغِيرُ إِذَا طَلَعَ الْفَجْرُ وَكَانَ يَسْتَمِعُ الْأَذَانَ فَإِنْ سَمِعَ الْأَذَانَ أَمْسَكَ وَإِلَّا أَغَارَ قَالَ فَسَمِعَ رَجُلًا يَقُولُ اللهُ أَكْبَرُ اللهُ أَكْبَرُ فَقَالَ رَسُولُ اللهِ ﷺ عَلَى الْفِطْرَةِ ثُمَّ قَالَ أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللهُ فَقَالَ رَسُولُ اللهِ ﷺ خَرَجْتَ مِنَ النَّارِ قَالَ فَنَظَرُوا فَإِذَا هُوَ رَاعِي مِعْزَى  

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 فَكَانَ يَسْتَمِعُ فَإِنْ سَمِعَ أَذَانًا 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] 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  

I heard the Messenger of Allah ﷺ say: Allah is pleased with a shepherd of goats who calls to prayer at the peak of a mountain, and offers prayer, Allah, the Exalted, says: Look at this servant of Mine; he calls to prayer and offers it and he fears Me. So I forgive him and admit him to paradise. (Using translation from Abū Dāʾūd 1203)   

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ يَعْجَبُ رَبُّكَ مِنْ رَاعِي غَنَمٍ فِي رَأْسِ شَظِيَّةٍ لِلْجَبَلِ يُؤَذِّنُ لِلصَّلَاةِ وَيُصَلِّي فَيَقُولُ اللهُ ﷻ انْظُرُوا إِلَى عَبْدِي هَذَا يُؤَذِّنُ وَيُقِيمُ لِلصَّلَاةِ يَخَافُ مِنِّي قَدْ غَفَرْتُ لِعَبْدِي وَأَدْخَلْتُهُ جَنَّتِي  

[Machine] A man should not be on a piece of land where there is water or clean land and then call for prayer and establish it, then pray. In the hadith of Abu Al-Abbas, the one who establishes it is either blind or the servants of Allah who cannot see its borders, or he said its edges, Shakkat Al-Taymi.  

لَا يَكُونُ رَجُلٌ بِأَرْضِ فَيْءٍ فَيَتَوَضَّأُ أَوْ يَتَيَمَّمُ صَعِيدًا طَيِّبًا فَيُنَادِي بِالصَّلَاةِ ثُمَّ يُقِيمُهَا فَيُصَلِّي وَفِي حَدِيثِ أَبِي الْعَبَّاسِ فَيُقِيمُهَا إِلَّا أَمَّ مِنْ جُنُودِ اللهِ مَنْ لَا يُرَى قُطْرَاهُ أَوْ قَالَ طَرَفَاهُ شَكَّ التَّيْمِيُّ  

[Machine] A man should not do wudu' (ablution) if there is water available, but he cannot find water, he should do tayammum (dry ablution). He should then call for prayer and establish it, except if he is from the soldiers of Allah who cannot be seen. Or he said, his side cannot be seen. This is the correct statement that is stopped. However, it was narrated as raised, and its raising is not valid.  

لَا يَكُونُ رَجُلٌ بِأَرْضِ فَيْءٍ فَيَتَوَضَّأُ إِنْ وَجَدَ مَاءً وَإِلَّا يَتَيَمَّمُ فَيُنَادِي بِالصَّلَاةِ ثُمَّ يُقِيمُهَا إِلَّا أَمَّ مِنْ جُنُودِ اللهِ ﷻ مَا لَا يُرَى طَرَفَاهُ أَوْ قَالَ طَرْفُهُ هَذَا هُوَ الصَّحِيحُ مَوْقُوفٌ وَقَدْ رُوِيَ مَرْفُوعًا وَلَا يَصِحُّ رَفْعُهُ  

[Machine] The Prophet ﷺ said, "There is no man who is in a place of prayer and the call to prayer is made, and he establishes the prayer and prays, except that a row of angels stands behind him, invisible to him. They bow with his bowing and prostrate with his prostration, and they supplicate with his supplication."  

قَالَ النَّبِيُّ ﷺ مَا مِنْ رَجُلٍ يَكُونُ بِأَرْضِ فَيْءٍ فَيُؤَذِّنُ بِحَضْرَةِ الصَّلَاةِ وَيُقِيمُ الصَّلَاةَ فَيُصَلِّي إِلَّا صَفَّ خَلْفَهُ مِنَ الْمَلَائِكَةِ مَا لَا يُرَى قُطْرَاهُ يَرْكَعُونَ بِرُكُوعِهِ وَيَسْجُدُونَ بِسُجُودِهِ وَيُؤَمِّنُونَ عَلَى دُعَائِهِ