"We used to talk behind Allah's Messenger (S) during the Salat, a man among us would talk to his companions next to him until (the following) was revealed: And stand before Allah with obedience. (2:238) So we were ordered to be silent and prohibited from talking."
Reference: Jami` at-Tirmidhi 405 In-book : Book 2, Hadith 258 English translation : Vol. 1, Book 2, Hadith 405
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