Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Bukhari :: Book 5 :: Volume 59 :: Hadith 668
When Abu Musa arrived (at Kufa as a governor) he honored this family of Jarm (by paying them a visit). I was sitting near to him, and he was eating chicken as his lunch, and there was a man sitting amongst the people. Abu Musa invited the man to the lunch, but the latter said, "I saw chickens (eating something (dirty) so I consider them unclean." Abu Musa said, "Come on! I saw the Prophet eating it (i.e. chicken)." The man said "I have taken an oath that I will not ea (chicken)" Abu Musa said." Come on! I will tell you about your oath. We, a group of Al-Ash'ariyin people went to the Prophet and asked him to give us something to ride, but the Prophet refused. Then we asked him for the second time to give us something to ride, but the Prophet took an oath that he would not give us anything to ride. After a while, some camels of booty were brought to the Prophet and he ordered that five camels be given to us. When we took those camels we said, "We have made the Prophet forget his oath, and we will not be successful after that." So I went to the Prophet and said, "O Allah' Apostle ! You took an oath that you would not give us anything to ride, but you have given us." He said, "Yes, for if I take an oath and later I see a better solution than that, I act on the later (and gave the expiation of that oaths"
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