Anas Radiyallahu 'Anhu reports that Rasulullah Sallallahu 'Alayhi Wasallam said:
"Even if I am given a foot of a goat as a present, I will accept it, and if I am invited to partake of it, I will surely accept that invitation". (DE)
English reference (DE): Book 46, Hadith 320 (DE)
Arabic reference (DE): Book 47, Hadith 337 (DE)