Prayer (Kitab Al-Salat)
2/151. Chapter:
What Should Be Said When One Raises His Head From The Ruku'
Sunan Abi Dawud
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ، عَنْ مَالِكٍ، عَنْ سُمَىٍّ، عَنْ أَبِي صَالِحٍ السَّمَّانِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " إِذَا قَالَ الإِمَامُ سَمِعَ اللَّهُ لِمَنْ حَمِدَهُ فَقُولُوا اللَّهُمَّ رَبَّنَا لَكَ الْحَمْدُ فَإِنَّهُ مَنْ وَافَقَ قَوْلُهُ قَوْلَ الْمَلاَئِكَةِ غُفِرَ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ " .
Abu Hurairah reported the Messenger of Allah (ﷺ) as saying: When the Imam says: “Allah listens to him who praised Him,” say: “O Allah, our lord, to Thee be the praise, “ for if what anyone says synchronises with what the angels say, he will be forgiven his past sins.
Reference : Sunan Abi Dawud 848In-book reference : Book 2, Hadith 458English translation : Book 2, Hadith 847