Read Numbers 18:28 Using Other Translations
Thus ye also shall offer an heave offering unto the LORD of all your tithes, which ye receive of the children of Israel; and ye shall give thereof the LORD'S heave offering to Aaron the priest.
So you shall also present a contribution to the LORD from all your tithes, which you receive from the people of Israel. And from it you shall give the LORD's contribution to Aaron the priest.
You must present one-tenth of the tithe received from the Israelites as a sacred offering to the LORD . This is the LORD ’s sacred portion, and you must present it to Aaron the priest.