Out of all your gifts - The spirit of this law would extend to all the revenues of the Levites; of the increase of their cattle, as well as of their tithes, a tithe would be paid by them for the Lord’s service.
Related Commentaries of Numbers 18:29
Numbers 18:29
29 Out of all your gifts ye shall offer every heave offering of the LORD, of all the bestc thereof, even the hallowed part thereof out of it.