Abdullah bin Abbas (may Allah be pleased with them both) narrates: Once the Prophet Muhammad (peace be upon him) was delivering a sermon when he saw a man standing in the sun. He inquired about him. The people said: This is Abu Isra'il. He has vowed to stand in the sun, not to sit, not to come into the shade, not to speak to anyone, and not to break his (voluntary) fast. The Prophet Muhammad (peace be upon him) said: Tell him to sit down, come into the shade, speak to others, and to continue or break his (voluntary) fast as he wishes.

Abdullah bin Buraidah narrates from his father: The Prophet Muhammad (peace be upon him) was returning from a battle when a black girl came and said, "O Messenger of Allah (peace be upon him)! I had vowed that if Allah brought you back safely, I would beat the drum (duff) near you." The Prophet (peace be upon him) said, "If you had made a vow, then do so; otherwise, do not." She said, "I had made a vow," so the Prophet (peace be upon him) sat down and she beat the drum.

Sayyidah Aisha Siddiqa (may Allah be pleased with her) narrates this statement of the Prophet Muhammad (peace be upon him): "Whoever makes a vow to obey Allah should obey Him, and whoever makes a vow to disobey Allah should not disobey Him."

Sayyidah Aisha Siddiqa (may Allah be pleased with her) narrates this statement of the Prophet Muhammad (peace and blessings be upon him): "Whoever makes a vow to obey Allah, he should obey Him; and whoever makes a vow to disobey Allah, he should not disobey Him."

Lady Aisha Siddiqa (may Allah be pleased with her) narrates this statement of the Prophet Muhammad (peace and blessings be upon him): "Whoever makes a vow to obey Allah, he should obey Him; and whoever makes a vow to disobey Allah, he should not disobey Him."

Sayyidah Aisha Siddiqa (may Allah be pleased with her) narrates that the Prophet Muhammad (peace and blessings be upon him) said: "Whoever makes a vow to disobey Allah, he should not disobey Him."

Sayyiduna Imran bin Husayn (may Allah be pleased with him) narrates this statement of the Noble Prophet (peace and blessings be upon him): "A vow regarding a sin should not be fulfilled, nor should a vow be fulfilled regarding something over which a servant has no control (the narrator is in doubt, perhaps these are the words) over which the son of Adam has no control."

Sayyiduna Imran bin Husain (may Allah be pleased with him) narrates: A Muslim woman was taken captive by the polytheists. They had previously captured a she-camel belonging to the Prophet (peace and blessings be upon him). When the woman saw that those people were heedless, she made a vow that if Allah granted her salvation by allowing her to ride that she-camel, she would sacrifice it. The narrator states: So the woman was saved, she came to Madinah Munawwarah, and then she began to sacrifice the she-camel. The people stopped her from doing so. This matter was mentioned to the Prophet (peace and blessings be upon him), so the Prophet (peace and blessings be upon him) said: You have given it a very bad reward. Then he (peace and blessings be upon him) said: It is not obligatory for a person to fulfill a vow that involves sin, or that concerns something which he does not own.

Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates: Sayyiduna Sa’d bin Ubadah (may Allah be pleased with him) asked the Prophet (peace and blessings be upon him) about an issue: He said, "My mother has passed away and she had a vow upon her which she did not fulfill." So the Prophet (peace and blessings be upon him) said, "Fulfill it on her behalf."

Sayyiduna Abdullah bin Abbas (may Allah be pleased with them) narrates: Sayyiduna Sa’d bin Ubadah (may Allah be pleased with him) asked the Prophet (peace and blessings be upon him) about the vow which his mother had made, but she passed away before fulfilling it. The Prophet (peace and blessings be upon him) said: Fulfill it on her behalf.