مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2868
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Abu ‘Ulwan said: I heard Ibn 'Abbas (رضي الله عنه) say: Fifty prayers were enjoined upon your Prophet (ﷺ), then he asked his Lord, may He be glorified and exalted, and He made them five.
Musnad Ahmad 2889Saheeh because of corroborating evidence; this is a da’eef i