Ibn Mas'ud Radiyallahu 'Anhu says:
"Rasulullah Sallallahu 'Alayhi Wasallam loved the meat of the forequarter. Rasulullah Sallallahu 'Alayhi Wasallam was-given poison in the dhiraa portion of the meat. It is suspected that the Jews poisoned him'.
English reference: Book 25, Hadith 159
Arabic reference: Book 26, Hadith 168