Hosea was urged by the Lord to marry Gomer. Gomer was known for her unfaithfulness.
Hosea 1:2 “When the Lord first spoke through Hosea, the Lord said to Hosea, “Go, take to yourself a wife of whoredom and have children of whoredom, for the land commits great whoredom by forsaking the Lord.”
Hosea and Gomer is a very unique arranged marriage. God has arranged this marriage as a living object lesson.