In the time of the Prophet (ﷺ) a man took a vow to slaughter a camel at Buwanah. So he came to the Prophet (ﷺ) and said: I have taken a vow to sacrifice a camel at Buwanah.

The Prophet (ﷺ) asked: Did the place contain any idol worshipped in pre-Islamic times?

They (the people) said: No.

He asked: Was any pre-Islamic festival observed there?

They replied: No.

The Prophet (ﷺ) said: Fulfil your vow, for a vow to do an act of disobedience to Allah must not be fulfilled, neither must one do something over which a human being has no control.
Sunan Abi Dawud Book 22, Hadith 72
← Previous Hadith On his father's authority, said that his grandfather said: A woman came to the Prophet (ﷺ) and said: Messenger 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.

Sunan Abi Dawud Book 22, Hadith 71 Next Hadith → I went out with my father to see the hajj performed by the Messenger of Allah (ﷺ). I saw the Messenger of Allah (ﷺ). I fixed my eyes on him. My father came near him while he was riding his she-camel. He had a whip like the whip of scribes. I heard the bedouin and the people say: The whip, the whip. My father came near him and held his foot. She said: He admitted his Prophethood and stood and listened to him.

He said: Messenger of Allah, I have made a vow that if a son is born to me, I shall slaughter a number of sheep at the end of Buwanah in the dale of hill.

The narrator said: I do not know (for certain) that she said: Fifty (sheep).

The Messenger of Allah (ﷺ) said: Does it contain any idol?

He said: No. Then he said: Fulfil your vow that you have taken for Allah. He then gathered them (i.e. the sheep) and began to slaughter them. A sheep ran away from them.

He searched for it saying: O Allah, fulfil my vow on my behalf. So he succeeded (in finding it) and slaughtered it.

Sunan Abi Dawud Book 22, Hadith 73