Mishkat al-Masabih #903
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
عَنِ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمَا قَالَ: كُنْتُ أَعْرِفُ انْقِضَاءَ صَلَاةِ رَسُولِ اللَّهِ صَلَّى الله عَلَيْهِ وَسلم بِالتَّكْبِيرِ
Ibn ‘Abbas said he used to know that God’s Messenger had finished his prayer when he heard the takbir.
(Bukhari and Muslim.)
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About Mishkat al-Masabih
This hadith is #903 from Mishkat al-Masabih, in the Book of Prayer.