Hadithcore
Sahih Muslim, 583 a
sahih

Ibn 'Abbas said:

We used to know that Allah's Messenger (ﷺ) had finished his prayer when we heard the takbir (Allah-O-Akbar).

حَدَّثَنَا زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ عَمْرٍو، قَالَ أَخْبَرَنِي بِذَا أَبُو مَعْبَدٍ، - ثُمَّ أَنْكَرَهُ بَعْدُ - عَنِ ابْنِ عَبَّاسٍ، قَالَ كُنَّا نَعْرِفُ انْقِضَاءَ صَلاَةِ رَسُولِ اللَّهِ صلى الله عليه وسلم بِالتَّكْبِيرِ ‏.‏

References2 variants
In-Book Reference
Book 5, Hadith 154
USC-MSA web (English) reference
Book 4, Hadith 1209 (deprecated numbering scheme)
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