مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3710
Musnad of Abdullah bin Mas'ood
It was narrated that ‘Abdullah (رضي الله عنه) said: The bone (with meat attached) that was most liked by The Messenger of Allah (ﷺ) was the foreleg, the foreleg of a sheep. Poison was put in the foreleg and he thought that the Jews were the ones who poisoned him.
Musnad Ahmad 3733Its isnad is da'eef, and Sa'd bin ‘Iyad is unknown]