It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) disliked seven parts of a sheep: the gall bladder, the bladder, the private part (of the female), the male organ, the testicles, the glands, and the blood. And the part of the sheep the Messenger of Allah (peace and blessings be upon him) loved most was its front part (the foreleg). He said: Food was brought to the Prophet (peace and blessings be upon him), and the people began handing him (peace and blessings be upon him) morsels of meat (from the foreleg and so on), so the Messenger of Allah (peace and blessings be upon him) said: "Indeed, the finest meat is the meat of the back."
Hadith Referenceالمعجم الأوسط / باب الياء / 9480
Hadith Gradingمحدثین:إسناده ضعيف لضعف يحيى بن عبد الحميد الحماني
Hadith Takhrij«قال الهيثمي: فيه يحيى الحماني وهو ضعيف «مجمع الزوائد ومنبع الفوائد، ج 5، ص 36»»