Sunan Abi Dawud — Oaths and Vows (Kitab Al-Aiman Wa Al-Nudhur)

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.

The Prophet (ﷺ) said: I will not forgive anyone who kills after accepting blood-wit

When the Messenger of Allah (ﷺ) was distributing something, a man came towards him and bent down on him. The Messenger of Allah (ﷺ) struck him with a bough and his face was wounded. The Messenger of Allah (ﷺ) said to him: Come and take retaliation. He said: no, I have forgiven, Messenger of Allah!.

“The Muslim has four things due from the Muslim: He should answer [by saying Yarhamuk-Allah (may Allah have mercy on you)] to him if he sneezes (and says Al-Hamdulillah); he should accept his invitation if he invites him; he should attend his funeral if he dies; and he should visit him if he falls sick.”

the Prophet, said: “What is Haram does not make what is Halal into what is Haram.”

“Whoever believes in the Last Day, let him honor his guest, and grant him reward for a day and a night. And it is not permissible for him to stay so long that he causes annoyance to his host. Hospitality is for three days, and whatever he spends on him after three days is charity.”