From Pope St. John Paul II’s Apostolic Exhortation Familiaris Consortio (1981):
The communion of love between God and people, a fundamental part of the Revelation and faith experience of Israel, finds a meaningful expression in the marriage covenant which is established between a man and a woman.
For this reason the central word of Revelation, “God loves His people,” is likewise proclaimed through the living and concrete word whereby a man and a woman express their conjugal love. Their bond of love becomes the image and the symbol of the covenant which unites God and His people.24 And the same sin which can harm the conjugal covenant becomes an image of the infidelity of the people to their God: idolatry is prostitution,25 infidelity is adultery, disobedience to the law is abandonment of the spousal love of the Lord. But the infidelity of Israel does not destroy the eternal fidelity of the Lord, and therefore the ever faithful love of God is put forward as the model of the faithful love which should exist between spouses.26
24 Cf., e.g., Hos 2:21; Jer 3:6-13; Is 54.
25 Cf. Ez 16:25.
26 Cf. Hos 3.
— Familiaris Consortio 12