Bible Verses About Tithes: Tithe of tithes for priests

Command the Levites, and declare unto them: When you shall receive of the children of Israel the tithes, which I have given you, offer the firstfruits of them to the Lord, that is to say, the tenth part of the tenth:

And the priest the son of Aaron shall be with the Levites in the tithes of the Levites, and the Levites shall offer the tithe of their tithes in the house of our God, to the storeroom into the treasure house.