1 Corinthians 7:2, 28, 36, 39

But, because of fornications, let each man have his own wife, and let each woman have her own husband.

But shouldest thou marry, thou hast not sinned; and if a virgin marry, she hath not sinned. Yet such shall have tribulation in the flesh: and I would spare you.

But if any man thinketh that he behaveth himself unseemly toward his virgin daughter, if she be past the flower of her age, and if need so requireth, let him do what he will; he sinneth not; let them marry.

A wife is bound for so long time as her husband liveth; but if the husband be dead, she is free to be married to whom she will; only in the Lord.