Muwatta Malik 196
موطأ مالك#196SahihYahya 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
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliSahih
In-book reference: 3:29