Deuteronomy 19:14

Thou shalt not remove thy neighbour’s landmark. — Another law manifestly appropriate here, where it appears for the first time, like the “field” in the tenth commandment (Deuteronomy 5:21). But the immediate connection is not obvious. Perhaps the idea is to caution the people to avoid a most certain incentive to hatred and murder. Ancient landmarks are also important and almost sacred witnesses.

They of old time. — The first dividers of the land. There is no idea of antiquity about the expression.