Eternal marriage

Celestial marriage (also called the New and Everlasting Covenant of Marriage, Eternal Marriage, Temple Marriage or The Principle) is a doctrine of Mormonism, particularly The Church of Jesus Christ of Latter-day Saints (LDS Church) and branches of Mormon fundamentalism.

Within the LDS Church, celestial marriage is an ordinance associated with a covenant that usually takes place inside temples by those authorized to hold the sealing power. The only people allowed to enter the temple, be married there, or attend these weddings are those who hold an official temple recommend. Obtaining a temple recommend requires one to abide by LDS Church doctrine and be interviewed and considered worthy by their bishop and stake president. A prerequisite to contracting a celestial marriage, in addition to obtaining a temple recommend, involves undergoing the temple endowment, which involves making of certain covenants with God.

In particular, one is expected to promise to be obedient to all the Lord's commandments including living a clean chaste life, abstaining oneself from any impure thing, willing to sacrifice and consecrate all that one has for the Lord. In the marriage ceremony a man and a woman make covenants to God and to each other and are said to be sealed as husband and wife for time and all eternity. Mormonism, citing Matthew 16:19 and Matthew 18:18, distinguishes itself on this point from some other religious traditions by emphasizing that marriage relationships and covenants made in this life in the temple will continue to be valid in the next life if they abide by these covenants.

...
Wikipedia