The best meat is the meat of the back

It is narrated from Sayyiduna Abdullah bin Ja'far (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "The best meat is the meat of the back."

It is narrated from Sayyiduna Abdullah bin Ja'far (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "The finest meat is the meat of the back."
This narration is sahih (authentic) through both chains, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) that my father ordered "khazirah" (a dish prepared from meat and flour) to be prepared. I took it to the Messenger of Allah (peace and blessings be upon him), and he (peace and blessings be upon him) asked: "O Jabir! Is this meat?" I said: No, O Messenger of Allah! Rather, this is khazirah. Then I came back and told my father, and he said: Perhaps he (peace and blessings be upon him) desires to eat meat. So he slaughtered a house-reared goat, roasted it, and ordered me to take it to him (peace and blessings be upon him). (When I arrived,) he (peace and blessings be upon him) said: "May Allah Almighty reward the Ansar with the best reward on our behalf, especially Abdullah bin Amr bin Haram and Sa'd bin Ubadah."
This hadith has a sahih (authentic) chain, but the two Shaykhs (Bukhari and Muslim) did not record it.