Narrated Suwayd ibn Hanzalah: We went out intending (to visit) the Messenger of Allah (ﷺ) and Wa'il ibn Hujr was with us. His enemy caught him. The people desisted from swearing an oath, but I took an oath that he was my brother. So he left him. We then came to the Messenger of Allah (ﷺ), and I informed him that the people desisted from taking the oath, but I swore that he was my brother. He said: You spoke the truth: A Muslim is a brother of a Muslim.

Narrated Thabit bin Adh-Dahhak: That he took oath of allegiance to the Messenger of Allah (ﷺ) under the tree. The Messenger of Allah (ﷺ) said: If anyone swears by religion other than Islam falsely, he is like what has has said. If anyone kills himself with something, he will be punished with it on the Day of Resurrection. A vow over which a man has no control is not binding on him.

Narrated Buraydah ibn al-Hasib: The Prophet (ﷺ) said: If anyone takes an oath and says: I am free from Islam; now if he is a liar (in his oath), he will not return to Islam with soundness.

Narrated Yusuf ibn Abdullah ibn Salam: I saw that the Prophet (ﷺ) put a date on a loaf and said: This is a thing eaten with bread (condiments).

Narrated Abdullah ibn Umar: The Prophet (ﷺ) said: If anyone says when swearing an oath: "If Allah wills," he makes an exception.

Narrated Abdullah ibn Umar: The Prophet (ﷺ) said: If anyone swears an oath and makes an exception, he may fulfil it if he wishes and break it if he wishes without any accountability for breaking.

Narrated Ibn 'Umar: The oath which the Messenger of Allah (ﷺ) often used was this: No, by Him who overturns the hearts.

Narrated AbuSa'id al-Khudri: When the Messenger of Allah (ﷺ) swore an oath strongly, he said: No, by Him in Whose hand is the soul of AbulQasim.

Narrated AbuHurayrah: When the Messenger of Allah (ﷺ) swore an oath, it was: No, and I beg forgiveness of Allah.

Narrated Laqit ibn Amir: We came to the Messenger of Allah (ﷺ) in a delegation. The Prophet (ﷺ) then said: By the age of thy god.

Narrated Abdullah ibn Abbas: AbuBakr adjured the Prophet (ﷺ). The Prophet (ﷺ) said: Do not adjure an oath.

Narrated Ibn 'Abbas: Abu Hurairah narrated that a man came to the Messenger of Allah (ﷺ) and said: I had a dream last night, and he then mentioned it. So Abu Bakr interpreted it. The Prophet (ﷺ) said: You are partly right and partly wrong. He then said: I adjure you, Messenger of Allah, may my father be sacrificed on you, do tell me the mistake I have committed. The Prophet (ﷺ) said: Do not adjure.

The tradition mentioned above has also been transmitted by Ibn 'Abbas through a different chain of narrators. In this version there is no mention of the word qasam (oath). It has the words: "He did not inform him."

Narrated 'Abd al-Rahman b. Abi Bakr: Some guests visited us, and Abu Bakr was conversing with the Messenger of Allah (ﷺ) at night. He (Abu Bakr) said: I will not return to you until you are free from their entertainment and serving them food. So he brought them food, but they said: We shall not eat it until Abu Bakr comes (back). Abu Bakr then came and asked: What did your guest do? Are you free from their entertainment ? They said: No. I said: I brought them food, but they refused and said: We swear by Allah, we shall not take it until he comes. They said: He spoke the truth. He brought it to us, but we refused (to take it) until you come. He asked: What did prevent you ? He said: I swear by Allah, I shall not take food tonight. They said: And we also swear by Allah that we shall not take food until you take it. He said: I never saw an evil like the one tonight. He said: Bring your food near (you). He ('Abd al-Rahman) said: Their food was then brought near them. He said: In the name of Allah, and he took the food, and they also took it. I then informed him that the dawn had broken. So he went to th Prophet (ﷺ) and informed him of what he and they had done. He said: You are the most obedient and most trustful of them.

A similar tradition has also been transmitted by 'Abd al-Rahman b. Abi Bakr through a different chain of narrators. This version adds on the authority of Salim: "Expiation (for breaking the oath) has not reached me."

Sa'id ibn al-Musayyab said: There were two brothers among the Ansar who shared an inheritance. When one of them asked the other for the portion due to him, he replied: If you ask me again for the portion due to you, all my property will be devoted to the decoration of the Ka'bah. Umar said to him: The Ka'bah does not need your property. Make atonement for your oath and speak to your brother. I heard the Messenger of Allah (ﷺ) say: An oath or vow to disobey the Lord, or to break ties of relationship or about something over which one has no control is not binding on you.

Narrated Abdullah ibn Amr ibn al-'As: The Messenger of Allah (ﷺ) said: A vow is binding in those things by which the pleasure of Allah is sought, and an oath to break ties of relationship is not binding.

Narrated Abdullah ibn Amr ibn al-'As: The Messenger of Allah (ﷺ) said: An oath or a vow about something over which a human being has no control, and to disobey Allah, and to break ties of relationship is not binding. If anyone takes an oath and then considers something else better than it, he should give it up, and do what is better, for leaving it is its atonement. Abu Dawud said: All sound traditions from the Prophet (ﷺ) say: "He should make atonement for his oath," except those versions which are not reliable. Abu Dawud said: I said to Ahmad: Yahya b. Sa'id (al-Qattan) has transmitted this tradition from Yahya b. 'Ubaid Allah. He (Ahmad b. Hanbal) said: But he gave it up after that, and he was competent for doing it. Ahmad said: His (Yahya b. 'Ubaid Allah's) tradition are munkar (rejected) and his father is not known.

Narrated Abdullah ibn Abbas: Two men brought their dispute to the Prophet (ﷺ). The Prophet (ﷺ) asked the plaintiff to produce evidence, but he had no evidence. So he asked the defendant to swear. He swore by Allah "There is no god but He." The Messenger of Allah (ﷺ) said: Yes, you have done it, but you have been forgiven for the sincerity of the statement: "There is no god but Allah." Abu Dawud said: This tradition means that he did not command him to make atonement

Narrated Abu Burdah: On the authority of his father that the Prophet (ﷺ) said: I swear by Allah that if Allah wills I shall swear on an oath and then consider something else to be better than it without making atonement for my oath and doing the thing that is better. Or he said (according to another version): But doing the thing that is better and making atonement for my oath.