مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2333
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Muhammad bin 'Amr bin 'Ata' that he heard Ibn 'Abbas (رضي الله عنه) say: I saw the Messenger of Allah (ﷺ) eat from a shoulder or leg [of an animal], then he got up and prayed, and he did not do wudoo’.
Musnad Ahmad 2341Its isnad is saheeh]