'Tithing' in the Bible

then this stone which I have made a standing pillar is a house of God, and all that Thou dost give to me -- tithing I tithe to Thee.'

and the priest, son of Aaron, hath been with the Levites in the tithing of the Levites, and the Levites bring up the tithe of the tithe to the house of our God unto the chambers, to the treasure-house;