Numbers 18:28

You will also contribute one-tenth of your income to Jehovah out of all that you receive from the Israelites' income. You will give Jehovah's contribution to the priest Aaron.

Genesis 14:18

King Melchizedek of Salem brought out bread and wine. He was priest of God Most High.

Hebrews 6:20-10

That is where Jesus has gone as a forerunner on our behalf. He has become a high priest forever after the order of Melchizedek.

Treasury of Scripture Knowledge

Summary

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.

Bible References

And ye shall

Genesis 14:18
King Melchizedek of Salem brought out bread and wine. He was priest of God Most High.
Hebrews 6:20
That is where Jesus has gone as a forerunner on our behalf. He has become a high priest forever after the order of Melchizedek.
Hebrews 7:1
Melchizedek, king of Salem, priest of the Most High God, met Abraham returning from the slaughter of the kings and blessed him.