In a Hadeeth on the authority of ‘Umar ibn Al-Khattaab, may Allah be pleased with him, he said to the Prophet, “O Messenger of Allah, I vowed during the pre-Islamic era to perform I‘tikaaf for a night in Al-Masjid Al-Haraam.”The Prophet, , said to him:“Fulfill your vow!Perform I‘tikaaf for a night”. [Al-Bukhari and Muslim]

In another narration, ‘Umar ibn Al-Khattaab, may Allah be pleased with him, asked the Messenger of Allah, , at Al-Ji‘irraanah on his way back from At-Taa’if,“O Messenger of Allah, I had taken a vow in the pre-Islamic era that I would observe I‘tikaaf for one day in Al-Masjid Al-Haraam, so what is your opinion?” He said:“Go and observe I‘tikaaf for a day.”[Al-Bukhari and Muslim]

Another narration reads, “When I embraced Islam, I asked the Prophet about that and he said:‘fulfill your vow!’” [Al-Bayhaqi and Al-Bazzaar]

Fourth: Affirming the fulfillment of promises and avoiding breaking them. The Prophet, , ordered ‘Umar, may Allah be pleased with him, to fulfill the vow though he took it in the pre-Islamic era.

Eighth: One should ask scholars about what he does not know because ‘Umar, may Allah be pleased with him, asked the Prophet, , about the ruling concerning that vow that he took upon himself in the pre-Islamic era. It is obligatory for the person asked to clarify the ruling and not to conceal it.

Ninth: Vowing to perform I‘tikaaf in any mosque other than the three Sacred Mosques; if this requires traveling, then, it is impermissible to do so because the Prophet, , said: “No journey should be made except to three mosques” If it does not require traveling, then, it is permissible.