(193) باب التَّكْبِيرِ بَعْدَ الصَّلاَةِ
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 (May peace be upon him).Ibn 'Abbas said : I used to know by it when they finished the prayer and would listen to it (making the mention of Allah).
Reference: Sunan Abi Dawud 1003
In-book reference: Book 2, Hadith 614
English translation: Book 2, Hadith 998