Numbers 18:28

So {you will present} your own contribution to Yahweh from all your tithes that you receive from the {Israelites}; from it you will give the contribution of Yahweh to Aaron the priest.

Genesis 14:18

And Melchizedek, the king of Salem, brought out bread and wine. (He was the priest of God Most High).

Hebrews 6:20-10

where Jesus, the forerunner for us, entered, [because he] became 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, the king of Salem, brought out bread and wine. (He was the priest of God Most High).
Hebrews 6:20
where Jesus, the forerunner for us, entered, [because he] became 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,