That the Prophet (Peace be upon him) said: "Whoever vowed to obey Allah, then he should obey Him. And whoever vowed to disobey Allah, then he should not disobey Him."
That the Messenger of Allah (Peace be upon him) said: "O 'Abdur-Rahman! Do not ask for a position of leadership, for if you receive it due to asking, you will be left alone with it, and if you receive it without asking, then you will be aided in it. And if you take an oath and you see that something else is better than it, then do what is better, and make an atonement for your oath."
That the Prophet (Peace be upon him) said: "Whoever takes an oath, and then he sees that something else is better than it, then he should make atonement for his oath and then do it."
That the Messenger of Allah (Peace be upon him) said: "Whoever swears about an oath and says: 'If Allah wills (Insha Allah), then there is no breaking of the oath against him."
That the Messenger of Allah (Peace be upon him) said: "Whoever swears [about an oath] and says: 'If Allah wills (Insha Allah), then he will not have broken it."
From his father (Ibn 'Umar) that the Prophet (Peace be upon him) heard 'Umar saying: "By my father, By my father!" So he said: "Verily Allah prohibits you from swearing by your father." So 'Umar said: "By Allah I did not swear by him after that, neither intentionally nor in narrating."
That the Messenger of Allah (Peace be upon him) came across 'Umar while he was on his mount, and he was swearing by his father. So the Messenger of Allah (Peace be upon him) said: "Verily Allah prohibits you from swearing by your fathers. So let the one who swears, swear by Allah, or be silent."
That Ibn 'Umar heard a man saying: "No by the Ka'bah" so Ibn 'Umar said: "Nothing is sworn by other than Allah, for I heard the Messenger of Allah (Peace be upon him) say: 'Whoever swears by other than Allah, he has committed disbelief or shirk.'"
"A Woman vowed to walk to the House of Allah, so the Prophet (Peace be upon him) asked about that, and he said: 'Verily Allah is in no need of her walking, order her to ride.'"
"The Prophet (Peace be upon him) passed by old man walking (while supported) between his two sons, so he said: 'What is the matter with this one?' They said: "O Messenger of Allah! He vowed to walk.' He said: 'Verily Allah [the Mighty and Sublime] is in no need of this person punishing himself.'" He said: "So he ordered him to ride."
That the Messenger of Allah (Peace be upon him) said: "Do not vow, for the vows does not prevent what is decreed at all, and it only causes the miser to spend (of his wealth)."
"I said:'O Messenger of Allah! I had vowed to perform I'tikaf in Al-Masjid Al-Haram for a night during the era of Jahiliyyah.' He said: 'Fulfill your vow.''"
From this father (Ibn Umar) who said: "The Messenger of Allah (Peace be upon him) often would swear with this oath: 'No! By the Changer of the Hearts.'"
"I heard the Messenger of Allah (Peace be upon him) saying: 'Whoever frees a believing slave, then Allah frees a limb from the Fire for each of his limbs, such that he frees his private parts in lieu of his private parts.'"
"I said: 'O Messenger of Allah! My sister vowed that she would walk to the House barefoot and without Khimar (covering).' The Prophet (Peace be upon him) said: 'Verily Allah will not do anything with the misery of your sister. She should ride, and cover, and fast three days.'"
That the Messenger of Allah (Peace be upon him) said: "Whoever among you swears, saying in his oath: 'By Al-Lat! By Al-'Uzza!' Then let him say 'La ilaha illa Allah' And whoever says: 'Come let me gamble with you!' Then let him give in charity."
That Sa'd bin 'Ubadah asked the Messenger of Allah (Peace be upon him) about a vow that was due from his mother, who died before fulfilling it. The Prophet (Peace be upon him) said: "Fulfill it for her."
Abu Umamah, and other than him from the Companions of the Prophet (Peace be upon him), narrated that the Prophet (Peace be upon him) said:
"Any Muslim man who frees a Muslim man, then it is his salvation from the Fire - each of his limbs suffices for a limb of himself. And any Muslim man that frees two Muslim women, then are his salvation from the Fire - each of their limbs suffices for a limb of himself. And any Muslim woman that frees a Muslim woman, then she is her salvation from the Fire - each of her limb suffices for a limb of herself."
13:47
15:25
18:59
57:54
21:04