betroth

Of a man: to promise to take (a woman) as a future spouse; to plight one's troth to.

And what man is there that hath betrothed a wife, and hath not taken her? let him goe and returne vnto his houſe, leſt he die in battel, and another man take her.

Often of a parent or guardian: to promise that (two people) be married to each other; specifically and chiefly, to promise that (a woman) be given in marriage to a man; to affiance.

He betrothed his daughter to a distant relative.

The couple were betrothed not long after they met each other.

Of God: to enter into a relationship with (believers, or the church as a whole); also, of a priest: to pledge (himself) to the church prior to being consecrated as a bishop.

And I [God] will betroth thee [his people] vnto me foreuer; yea, I will betroth thee vnto me in righteouſneſſe, and in iudgement, and in louing kindneſſe, and in mercies. I will euen betroth thee vnto me in faithfulneſſe, and thou ſhalt know the Lord.

God betrotheth thee in righteouſnes, and putteth righteouſnes into thee; […]

To pledge or promise oneself to (a cause); to espouse; also (sometimes reflexive), to pledge or promise (oneself or one's efforts) to a cause or to do something.

To priuate fight they haue betroutht themſelues, / Of which conflicte, the end muſt needes be this, / That one do liue, that other die the death.

[W]hat is he for a foole that betrothes himſelfe to vnquietneſſe?