Muwatta Malik #196
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ سُمَىٍّ، مَوْلَى أَبِي بَكْرٍ 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 " .
Yahya related to me from Malik from Sumayy, the mawla of Abu
Bakr, from Abu Salih as-Samman from Abu Hurayra that the Messenger of
Allah, may Allah bless him and grant him peace, said, "When the imam
says, 'Allah hears whoever praises Him,' say 'O Allah! Our Lord,
praise be toYou, 'for the previous wrong actions done by the one whose
utterance coincides with that of the angels are forgiven."
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About Muwatta Malik
This hadith is #196 from Muwatta Malik, in the Book of Prayer.