Sayyiduna Thabit bin al-Dahhak (may Allah be pleased with him) states that in the time of the Prophet (peace and blessings be upon him) a man vowed to sacrifice a camel at a place called Buwanah. The Prophet (peace and blessings be upon him) asked: "Was there any idol of the idols of the Jahiliyyah there that used to be worshipped?" They said: No. He (peace and blessings be upon him) said: "Is any festival held there?" They said: No. He (peace and blessings be upon him) said: "Fulfil your vow. A vow of disobedience is not to be fulfilled, nor is it necessary to fulfil a vow concerning what the son of Adam does not own."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النذور / 20139