It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that Sayyiduna Umar (may Allah be pleased with him) asked the Noble Prophet (peace and blessings be upon him), saying: "In the days of ignorance, I vowed to observe i'tikaf for one night." So the Noble Prophet (peace and blessings be upon him) said: "Fulfill your vow."