1-Significance.1.1-In Qur'an.1.2-In Hadith.2-Varieties of Marriage.2.1-Permanent Marriage.2.2-Temporary Marriage.3-Marriage Formula ('Aqd al-Nikah).3.1-Prohibited Cases.4-How a Marriage Formula Annuls.5-Rights.6-Choosing a Spouse.6.1-Some Criteria.7-In the Hereafter (Heaven).8-See Also.9-Notes.10-References.