مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2615
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn 'Abbas (رضي الله عنه) that as-Sa'b bin Jaththamah al-Laithi gave the rump of an onager to the Messenger of Allah (ﷺ) when he was in ihram, and he refused it, and it was dripping with blood.
Musnad Ahmad 2630Its isnad is saheeh, Muslim (1194)]