Sayyiduna Kardam bin Sufyan al-Thaqafi (may Allah be pleased with him) came to the Messenger of Allah (peace and blessings be upon him) and said: O Messenger of Allah, I have vowed to slaughter a small herd of camels at Buwanah. The Messenger of Allah (peace and blessings be upon him) said to him: "At an idol?" He said: No. He (peace and blessings be upon him) said: "At one of the gatherings of the Jahiliyyah (pre-Islamic ignorance)?" He said: No. He (peace and blessings be upon him) said: "Then fulfil your vow wherever it may be. O Kardam, there is no vow and no oath in disobedience to Allah."
Hadith Referenceالمعجم الكبير للطبراني / باب الكاف / 16476