The Prophet ﷺ said: The imam is appointed only to be followed; when he says "Allah is most great," say "Allah is most great" and do not say "Allah is most great" until he says "Allah is most great." When he bows; bow; and do not bow until he bows. And when he says "Allah listens to him who praise Him," say "O Allah, our Lord, to Thee be the praise." The version recorded by Muslim goes: "And to Thee be the praise: And when he prostrate; and do not prostrate until he prostrates. When he prays standing, pray standing, and when he prays sitting, all of you pray sitting. Abu Dawud said: The words "O Allah, our Lord, to You be the praise" reported by Sulaiman were explained to me by some of our companions. (Using translation from Abū Dāʾūd 603)   

قَالَ النَّبِيُّ صَلَّى اللهٌ عَلَيْهِ وَسَلَّمَ إِنَّمَا جُعِلَ الْإِمَامُ لِيُؤْتَمَّ بِهِ فَإِذَا كَبَّرَ فَكَبِّرُوا وَلَا تُكَبِّرُوا حَتَّى يُكَبِّرَ وَإِذَا رَكَعَ فَارْكَعُوا وَلَا تَرْكَعُوا حَتَّى يَرْكَعَ وَإِذَا قَالَ سَمِعَ اللهُ لِمَنْ حَمِدَهُ فَقُولُوا اللهُمَّ رَبَّنَا لَكَ الْحَمْدُ قَالَ مُسْلِمٌ وَلَكَ الْحَمْدُ وَإِذَا سَجَدَ فَاسْجُدُوا وَلَا تَسْجُدُوا حَتَّى يَسْجُدَ وَإِذَا صَلَّى قَائِمًا فَصَلُّوا قِيَامًا وَإِذَا صَلَّى قَاعِدًا فَصَلُّوا قُعُودًا أَجْمَعِينَ قَالَ أَبُو دَاوُدَ اللهُمَّ رَبَّنَا لَكَ الْحَمْدُ أَفْهَمَنِي بَعْضُ أَصْحَابِنَا عَنْ سُلَيْمَانَ  

[Machine] Narrated by the Prophet ﷺ , he said: "When you hear the call to prayer, then walk calmly and serenely. Whatever part of it you catch, offer the prayer, and whatever you miss, make it up."  

عَنِ النَّبِيِّ ﷺ قَالَ إِذَا سَمِعْتُمُ الْإِقَامَةَ فَامْشُوا وَعَلَيْكُمُ السَّكِينَةُ فَمَا أَدْرَكْتُمْ فَصَلُّوا وَمَا فَاتَكُمْ فَاقْضُوا  

[Machine] They used to come for prayer and the Prophet ﷺ had already preceded them in some prayers, so they would gesture to them how many units of prayer he had performed with his fingers, one or two. Then Mu'adh came and the Prophet ﷺ had already preceded him in some prayers, so he entered the prayer and said, "I do not find him on a certain condition except that I am upon it." Then he completed [the prayer]. The Messenger of Allah ﷺ had already preceded him in some prayers, so he entered the prayer. When the Messenger of Allah ﷺ had finished the prayer, Mu'adh stood up to complete it. Upon seeing this, the Messenger of Allah ﷺ said, "Mu'adh will lead you like this, so do the same."  

كَانُوا يَأْتُونَ الصَّلَاةَ وَقَدْ سَبَقَهُمُ النَّبِيُّ ﷺ بِبَعْضِ الصَّلَاةِ فَيُشِيرُونَ إِلَيْهِمْ كَمْ صَلَّى بِالْأَصَابِعِ وَاحِدَةً ثِنْتَيْنِ فَجَاءَ مُعَاذٌ وَقَدْ سَبَقَهُ النَّبِيُّ ﷺ بِبَعْضِ الصَّلَاةِ فَدَخَلَ فِي الصَّلَاةِ فَقَالَ لَا أَجِدُهُ عَلَى حَالٍ إِلَّا كُنْتُ عَلَيْهَا ثُمَّ قَضَيْتُ فَجَاءَ وَقَدْ سَبَقَهُ بِبَعْضِ الصَّلَاةِ فَدَخَلَ فِي الصَّلَاةِ فَلَمَّا قَضَى رَسُولُ اللهِ ﷺ الصَّلَاةَ قَامَ مُعَاذٌ يَقْضِي فَقَالَ رَسُولُ اللهِ ﷺ قَدْ سَنَّ لَكُمْ مُعَاذٌ هَكَذَا فَافْعَلُوا  

[Machine] The man used to inform others about his previous prayers when he came to pray. And indeed, they stood with the Messenger of Allah ﷺ while he was standing, bowing, sitting, and prostrating. And they prayed with the Messenger of Allah ﷺ . Muadh then came, and they gestured to him. Shu'bah said, "I heard this from Husayn, meaning from Ibn Abi Layla." Muadh said, "I do not see any condition except that I was upon it." He said, "Muadh has prescribed a sunnah for you, so do as he did." And Ghandar narrated it from Shu'bah until his saying, "And Amr ibn Murrah said, and Husayn narrated it from Ibn Abi Layla until Muadh came." Shu'bah said, "And I heard it from Husayn, and I do not see any condition except until his saying, 'So do as he did.' Abu Ali al-Rudhbari informed us, Abu Bakr ibn Dasa narrated to us, Abu Dawud narrated to us, Ibn al-Muthanna narrated to us, Muhammad ibn Jafar narrated to us from Shu'bah, and he mentioned it."  

كَانَ الرَّجُلُ إِذَا جَاءَ يُصَلِّي فَيُخْبَرُ بِمَا سُبِقَ مِنْ صَلَاتِهِ وَإِنَّهُمْ قَامُوا مَعَ رَسُولِ اللهِ ﷺ مِنْ بَيْنِ قَائِمٍ وَرَاكِعٍ وَقَاعِدٍ وَمُصَلٍّ مَعَ رَسُولِ اللهِ ﷺ قَالَ فَجَاءَ مُعَاذٌ فَأَشَارُوا إِلَيْهِ قَالَ شُعْبَةُ وَهَذِهِ سَمِعْتُهَا مِنْ حُصَيْنٍ يَعْنِي عَنِ ابْنِ أَبِي لَيْلَى قَالَ فَقَالَ مُعَاذٌ لَا أَرَاهُ عَلَى حَالٍ إِلَّا كُنْتُ عَلَيْهَا قَالَ فَقَالَ إِنَّ مُعَاذًا قَدْ سَنَّ لَكُمْ سُنَّةً كَذَلِكَ فَافْعَلُوا 5148 وَرَوَاهُ غُنْدَرٌ عَنْ شُعْبَةَ إِلَى قَوْلِهِ مَعَ رَسُولِ اللهِ ﷺ ثُمَّ قَالَ قَالَ عَمْرُو بْنُ مُرَّةَ وَحَدَّثَنِي بِهَا حُصَيْنٌ عَنِ ابْنِ أَبِي لَيْلَى حَتَّى جَاءَ مُعَاذٌ قَالَ شُعْبَةُ وَقَدْ سَمِعْتُهَا مِنْ حُصَيْنٍ فَقَالَ لَا أَرَاهُ عَلَى حَالٍ إِلَى قَوْلِهِ كَذَلِكَ فَافْعَلُوا أَخْبَرَنَاهُ أَبُو عَلِيٍّ الرُّوذْبَارِيُّ أنبأ أَبُو بَكْرِ بْنُ دَاسَةَ ثنا أَبُو دَاوُدَ ثنا ابْنُ الْمُثَنَّى ثنا مُحَمَّدُ بْنُ جَعْفَرٍ عَنْ شُعْبَةَ فَذَكَرَهُ