Ibn Abbas: The end of the Salah of Rasulullah (ﷺ) was known by takbir.

Reference: Sunan Abi Dawud 1002

Sunan Abi Dawud 1002
Ibn ‘Abbas said:

The end of the prayer of the Messenger of Allah (ﷺ) was known by the takbir (pronounced aloud).

حَدَّثَنَا أَحْمَدُ بْنُ عَبْدَةَ، أَخْبَرَنَا سُفْيَانُ، عَنْ عَمْرٍو، عَنْ أَبِي مَعْبَدٍ، عَنِ ابْنِ عَبَّاسٍ، قَالَ كَانَ يُعْلَمُ انْقِضَاءُ صَلاَةِ رَسُولِ اللَّهِ صلى الله عليه وسلم بِالتَّكْبِيرِ ‏.
Reference  : Sunan Abi Dawud 1002
In-book reference  : Book 2, Hadith 613
 
Hadith that suggests that Salah was changed after the death of Rasulullah (ﷺ)

Reference: Sunan an-Nasa'i 1180

Sunan an-Nasa'i 1180
It was narrated that Mutarrif bin 'Abdullah said:

"Ali bin Abi Talib prayed, and he said the takbir every time he went down and came up, in all movements of the prayer. 'Imran bin Husain said: 'This reminds me of the prayer of the Messenger of Allah (ﷺ).'"

أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ، قَالَ حَدَّثَنَا غَيْلاَنُ بْنُ جَرِيرٍ، عَنْ مُطَرِّفِ بْنِ عَبْدِ اللَّهِ، قَالَ صَلَّى عَلِيُّ بْنُ أَبِي طَالِبٍ فَكَانَ يُكَبِّرُ فِي كُلِّ خَفْضٍ وَرَفْعٍ يُتِمُّ التَّكْبِيرَ ‏.‏ فَقَالَ عِمْرَانُ بْنُ حُصَيْنٍ لَقَدْ ذَكَّرَنِي هَذَا صَلاَةَ رَسُولِ اللَّهِ صلى الله عليه وسلم ‏.‏
Reference  : Sunan an-Nasa'i 1180
In-book reference  : Book 13, Hadith 2