مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3272
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
'Ali bin ‘Abdullah bin al-'Abbas narrated that Ibn ‘Abbas (رضي الله عنه) told him that a roasted shoulder (of meat) was brought to the Prophet (ﷺ) and he ate from it and enjoyed it, then he prayed and he did not do wrodoo" because of that.
Musnad Ahmad 3295A saheeh hadeeth]