John Wesley on Deuteronomy 24:1

Some uncleanness - Some hateful thing, some distemper of body or quality of mind not observed before marriage: or some light carriage, as this phrase commonly signifies, but not amounting to adultery. Let him write - This is not a command as some of the Jews understood it, nor an allowance and approbation, but merely a permission of that practice for prevention of greater mischiefs, and this only until the time of reformation, till the coming of the Messiah when things were to return to their first institution and purest condition.