A vow is an act of worship and a good deed by means of which one draws closer to Allah, Exalted is He, and it must be devoted exclusively to Him. In the Quran, Allah, Exalted is He, lauded His righteous servants, and promised them reward, making mention of the fulfillment of vows as one of their good qualities. He Says (what means): {They [are those who] fulfill [their] vows.} [Quran 76:7]. In this hadeeth, ‘Umar ibn Al-Khattaab (may Allah be pleased with him) narrated that he once told the Prophet ﷺ that he had vowed before his conversion to Islam to observe I’tikaaf in Al-Masjid Al-Haraam, the Sacred Mosque in Makkah. I‘tikaaf means a spiritual retreat in the mosque to draw closer to Allah, Exalted is He, (by devoting oneself exclusively to worship) during daytime or night. The Prophet ﷺ commanded him to fulfil his vow and ‘Umar (may Allah be pleased with him) complied and observed I’tikaaf. The Prophet ﷺ commanded ‘Umar (may Allah be pleased with him) to fulfill a vow that he had made before his conversion to Islam in the pre-Islamic time, because he (may Allah be pleased with him) had vowed to do a righteous and prescribed act that does not conflict with the Laws of Islam. However, if someone vows to do something that contravenes Islam, it is impermissible to fulfill such a vow. It is deduced from the hadeeth that it is permissible to observe I’tikaaf at night, and it is not conditional upon fasting. .