It is narrated from Sayyiduna Zayd (may Allah be pleased with him) that once the Messenger of Allah (peace and blessings be upon him) was sitting with his Companions talking with them; then he (peace and blessings be upon him) got up and went (into his house). Zayd (who was the youngest of them) sat in his (peace and blessings be upon him) place and began narrating to the Companions the sayings of the Prophet (peace and blessings be upon him). Meanwhile, a gift of meat came for the Messenger of Allah (peace and blessings be upon him). The people said to Zayd: O Abu Sa'id! Go to the Prophet (peace and blessings be upon him), convey our greetings of peace to him and say: Your Companions say that, if you see fit, you might send us some of this meat. (When Zayd went,) he (peace and blessings be upon him) said: "Go back to them, for they have already eaten meat after you left." Zayd came back and told them: I have conveyed your message, but he (peace and blessings be upon him) said that they have already eaten meat. The people said: We have not eaten any meat; this seems to be something significant. Let us go and ask the Messenger of Allah (peace and blessings be upon him) ourselves. They came and said: O Messenger of Allah! We sent word to you about the meat, and Zayd claims that we have already eaten meat, yet by Allah, we have not eaten any meat. The Messenger of Allah (peace and blessings be upon him) said: "It is as though I can see the green (trace) of Zayd's flesh in your teeth" (meaning: you have backbitten him by talking about him behind his back). They said: O Messenger of Allah! Seek forgiveness for us. So he (peace and blessings be upon him) prayed for forgiveness for them. This hadith has a sahih (authentic) chain, but the two Shaykhs (Bukhari and Muslim) did not record it.