Deuteronomy 24:1-2

King James Version

24 When a man hath taken a wife, and married her, and it come to pass that she find no favour in his eyes, because he hath found some uncleanness in her: then let him write her a bill of divorcement, and give it in her hand, and send her out of his house.

² And when she is departed out of his house, she may go and be another man's wife.