28 Thus ye also shall offer a heave-offering to the LORD of all your tithes which ye receive of the children of Israel; and ye shall give of them the LORD'S heave-offering to Aaron the priest.
Numbers 18:28 Cross References - Webster
Genesis 14:18
18 And Melchisedek, king of Salem, brought forth bread and wine: and he was the priest of the most high God.
Hebrews 6:20-7:10
20 Whither the forerunner hath for us entered, even Jesus, made a high priest for ever after the order of Melchisedec.