Deuteronomy 24:2
Ver. 2. And when she is departed out of his house,.... With her bill of divorce, by which departure out of his house it is notified to all:
she may go and be other man's [wife]; it was permitted her to marry another man, she being by her divorce freed from the law of her former husband; and who indeed, in express words contained in the divorce, gave her leave so to do; which ran thus,
"thou art in thine own hand, and hast power over thyself to go and marry any other man whom thou pleasest; and let no man hinder thee in my name, from this day forward and for ever; and, lo, thou art free to any man;''
See Gill on "Mt 5:31".