مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2869
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that: 'Abdullah bin 'Usm said: I heard Ibn 'Abbas (رضي الله عنه) say: Your Prophet (ﷺ) was enjoined to offer fifty prayers, then he asked his Lord, may He be glorified and exalted, and He made them five prayers.
Musnad Ahmad 2890Saheeh because of corroborating evidence, like the previous