Sahih al-Bukhari 3285
صحيح البخاري#3285SahihNarrated Abu Huraira:The Prophet (ﷺ) said, "When the call for the prayer is pronounced, Satan takes to his heels, passing wind with noise, When the call for the prayer is finished, he comes back. And when the Iqama is pronounced, he again takes to his heels, and after its completion, he returns again to interfere between the (praying) person and his heart, saying to him. 'Remember this or that thing.' till the person forgets whether he has offered three or four rak`at: so if one forgets whether he has prayed three or four rak`at, he should perform two prostrations of Sahu (i.e. forgetfulness)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 59:94