We knew the finishing of the prayer of the Messenger of Allah (ﷺ) through takbir. 'Amr (b. Dinar) said: I made a mention of it to Abu Mas'ud. hue he rejected it and said: I never narrated it to you. 'Amr said: He did narrate it before this.
Reference: Sahih Muslim 583 b In-book : Book 5, Hadith 155 USC-MSA web (English) : Book 4, Hadith 1210 (deprecated)
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