Abdullah bin, Ja'far Radiyallahu 'Anhu says:
"Rasulullah Sallallahu 'Alayhi Wasallam said: "The best meat is that of the back portion." (RU)
English reference (RU): Book 25, Hadith 162 (RU)
Arabic reference (RU): Book 26, Hadith 171 (RU)