Fixed time marriage.
Useful information: In a fixed time marriage (Mut'ah) the period of companionship is fixed, for example, when matrimonial alliance is concluded with a woman for an hour. or a day, or a month, or a year, or more.
In the sura entitled 'Women', after listing those women to whom marriage is forbidden, the Qur'an states as follows: 'Lawful for you is what is beyond all that, that you may seek, using your wealth, in wedlock and not in licence. So those of them whom you enjoy, give them their appointed wages; it is no fault in you in agreeing together, after the due apportionate. God is All-Knowing, All-Wise' (4:24). All Shi'i ulama' and some Sunni ulama' hold that this verse-especially the words: 'Such wives as you enjoy (istamta'tum)'-refers to the permissibility of mut'a. The Shi'is present several arguments to prove this point.