For the tithes were all given to the Levites, and out of their tithes the tenth was given to the priests, here Numbers 18:26, & C, and Nehemiah 10:37,38.
Related Commentaries of Numbers 18:21
Numbers 18:21
21 And, behold, I have given the children of Levi all the tenth in Israel for an inheritance, for their service which they serve, even the service of the tabernacle of the congregation.