Reference: Betrothment
Morish
Among the Jews this was looked upon as being as binding as marriage, and could not be dissolved except by divorce. Certain laws were given as to a betrothed woman. Ex 21:8-9; De 20:7; 28:30. Mary, the mother of the Lord Jesus, was betrothed to Joseph, and he contemplated putting her away privately, but was instructed as to the truth of her condition by the angel of the Lord. Mt 1:18-19; Lu 1:27; 2:5. It is used symbolically to express Jehovah's favour to His ancient people in a future day, when He will 'betroth' them to Himself for ever. Ho 2:19-20. Also as to the position in which the church stands to Christ: Paul wrote to the Corinthian saints "I have espoused you to one husband, that I may present you as a chaste virgin to Christ." 2Co 11:2. The conduct of the saints should be true to this betrothal.
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Watsons
BETROTHMENT, a mutual promise or compact between two parties for a future marriage. The word imports, as much as giving one's troth; that is, true faith, or promise. Among the ancient Jews, the bethrothing was performed either by a writing, or by a piece of silver given to the bride. After the marriage was contracted, the young people had the liberty of seeing each other, which was not allowed them before. If, after the betrothment, the bride should trespass against that fidelity she owed to her bridegroom she was treated as an adulteress. See MARRIAGE.