Abu Hurairah · The Book of Oaths and Vows

"By my father and by my mother." He said: "Allah forbids you to swear by your forefathers." 'Umar said: "By Allah, I never swore by them again, whether saying it for myself or reporting it of others."

I heard 'Aishah say: "The Prophet used to stay with Zainab bint Jahsh and drink honey at her house. Hafsah and I agreed that if the Prophet came to either of us, she would say: 'I detect the smell of Maghafir (a nasty-smelling gum) on you. Have you eaten Maghafir?' He went to one of them and she said that to him. He said: 'No, rather I drank honey at the house of Zainab bint Jahsh, but I will never…

"I entered the house of the Prophet with him and there was some bread and vinegar. The Messenger of Allah said: 'Eat; what a good condiment is vinegar.'"

"Sa'd bin 'Ubadah asked the Messenger of Allah about a vow which his mother had sworn, but she died before she could fulfill it. The Messenger of Allah said: 'Fulfill it on her behalf.'"

It was narrated from Ibn 'Umar that 'Umar had vowed -during the Jahiliyyah- to spend a day in 'Itikaf. He asked the Messenger of Allah about that, and he commanded him to perform the 'Itikaf.

My father told me that a man told him, that he asked 'Imran bin Husain about a man who made a vow not to attend the prayers in the mosque of his people. 'Imran said: I heard the Messenger of Allah say: There is no vow at a moment of anger and its expiation is the expiation for an oath.