مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3108
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn 'Abbas (رضي الله عنه) said: as-Sa'b gave the Messenger of Allah (ﷺ) half of an onager when he was in ihram and he refused it. Bahz said: the back of an onager or the foot of an onager.
Musnad Ahmad 3132Its isnad is saheeh, Muslim (1194)]