Numbers 18:28

So you shall also present an offering to the Lord from your tithes, which you receive from the sons of Israel; and from it you shall give the Lord’s offering to Aaron the priest.

Genesis 14:18

And Melchizedek king of Salem brought out bread and wine; now he was a priest of God Most High.

Hebrews 6:20-10

where Jesus has entered as a forerunner for us, having become a high priest forever according to 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
And Melchizedek king of Salem brought out bread and wine; now he was a priest of God Most High.
Hebrews 6:20
where Jesus has entered as a forerunner for us, having become a high priest forever according to the order of Melchizedek.
Hebrews 7:1
For this Melchizedek, king of Salem, priest of the Most High God, who met Abraham as he was returning from the slaughter of the kings and blessed him,