'Husband to be' in the Bible

So after Abram had lived in Canaan for ten years, Sarai, Abram's wife, gave Hagar, her Egyptian servant, to her husband to be his wife.

Wail like a young virgin clothed in sackcloth, lamenting the death of her husband-to-be.

Because Joseph, her husband to be, was a righteous man, and because he did not want to disgrace her, he intended to divorce her privately.