Oaths and Vows (Kitab Al-Aiman Wa Al-Nudhur)
Dawud :: Book 21 : Hadith 3306
Narrated Abdullah ibn Amr ibn al-'As:
A woman came to the Prophet (peace_be_upon_him) and said: Apostle of Allah, I have taken a vow to play the tambourine over you.
He said: Fulfil your vow.
She said: And I have taken a vow to perform a sacrifice in such a such a place, a place in which people had performed sacrifices in pre-Islamic times.
He asked: For an Idol?
She replied: No.
He asked: For an image?
She replied: No.
He said: Fulfil your vow.