The Lord is his inheritance, i.e. the Lord's portion, to wit, tithes and offerings, which belong to God, are given by him to the Levites for their subsistence from generation to generation, as inheritances run.
Related Commentaries of Deuteronomy 10:9
Deuteronomy 10:9
9 Wherefore Levi hath no part nor inheritance with his brethren; the LORD is his inheritance, according as the LORD thy God promised him.