It is narrated from Umm Abdullah (may Allah be pleased with her), the sister of Sayyiduna Shaddad bin Aws (may Allah be pleased with him), that she sent a cup of milk to the Prophet (peace and blessings be upon him) at the time of his breaking the fast, and that was on a long day in intense heat. The Messenger of Allah (peace and blessings be upon him) sent the messenger back to ask: "Where did you get this milk from?" She replied: It is from my own goat. He (peace and blessings be upon him) again sent the messenger: "Where did you get this goat from?" She said: I bought it with my own wealth. Then he (peace and blessings be upon him) drank it. When the next day came, Umm Abdullah (may Allah be pleased with her) came to the Messenger of Allah (peace and blessings be upon him) and said: O Messenger of Allah! I sent that milk to you out of compassion for your state because of the intense heat and the long day, but you sent the messenger back (to investigate)? The Prophet (peace and blessings be upon him) said: "That is what the messengers were commanded: that they eat only what is pure and do righteous deeds." This hadith has an authentic (sahih) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.