CCC 1638
© Libreria Editrice Vaticana Source: vatican.va
"From a valid marriage arises a bond between the spouses which by its very nature is perpetual and exclusive; furthermore, in a Christian marriage the spouses are strengthened and, as it were, consecrated for the duties and the dignity of their state by a special sacrament." Cf. CIC, can. 1134.
Read the full chapter 3. The Sacraments at the Service of Communion ¶1533–1666