Wife under whose authority?

And the priest shall set the woman before the LORD and unbind the hair of the woman’s head and place in her hands the grain offering of remembrance, which is the grain offering of jealousy. And in his hand the priest shall have the water of bitterness that brings the curse. Then the priest shall make her take an oath, saying, ‘If no man has lain with you, and if you have not turned aside to uncleanness while you were under your husband’s authority, be free from this water of bitterness that brings the curse. But if you have gone astray, though you are under your husband’s authority, and if you have defiled yourself, and some man other than your husband has lain with you, then’ (let the priest make the woman take the oath of the curse, and say to the woman) ‘the LORD make you a curse and an oath among your people, when the LORD makes your thigh fall away and your body swell. Numbers 5:18-21

As is plainly visible, the wife is under the authority of the husband…not a minister, preacher, pastor, elder, bishop, deacon, employer! or anyone else. This is further strengthened by the following:

But I want you to understand that the head of every man is Christ, the head of a wife is her husband, and the head of Christ is God. 1 Corinthians 11:3