مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1932
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from "Amr, from Ibn Ma"bad, that Ibn "Abbas said: I only knew that the prayer of the Messenger of Allah (ﷺ) had ended from the takbeer.
Musnad Ahmad 1933Sahih (Darussalam) [ al-Bukhari (841) and Muslim (583)]