Hadith 1002
Ibn Abbas said: The end of the prayer of the Messenger of Allah ﷺ was known by the takbir (pronounced aloud).
Hadith 1003
Ibn Abbas said: To raise the voice for making the mention of Allah after the people had finished their obligatory prayer was for in vogue the time of the Messenger of Allah ﷺ. Ibn Abbas said: I used to know by it when they finished the prayer and would listen to it (making the mention of Allah).