'Law of Moses' in the Bible

Now, the sons of the Kenite, father-in-law of Moses, had come up from the city of palm-trees, with the sons of Judah, into the wilderness of Judah, which is in the south of Arad, - so they went and dwelt with the people.

Now, Heber the Kenite, had separated himself from the Kenites, even from the sons of Hobab, father-in-law of Moses, - and moved his tent as far as the oak of Zaanaim, which is near Kadesh.