Thabit b. ad-Dahhak said that in the time of God's Messenger a man took a vow to slaughter camels at Buwana and came and told him. God’s Messenger asked whether the place contained any idol worshipped in pre-Islamic times and was told that it did not. He asked whether any pre-Islamic festival was observed there and was told that no such thing was observed. He then said to the man, “Fulfil your vow, for a vow to do an act of disobedience to God must not be fulfilled, neither must one to do something over which a human being has no control.” Abu Dawud transmitted it.