Leviticus 27:30 ASV
(30) And all the tithe of the land, whether of the seed of the land, or of the fruit of the tree, is Jehovah's: it is holy unto Jehovah.
Numbers 18:24 ASV
(24) For the tithe of the children of Israel, which they offer as a heave-offering unto Jehovah, I have given to the Levites for an inheritance: therefore I have said unto them, Among the children of Israel they shall have no inheritance.
Deuteronomy 14:23 ASV
(23) And thou shalt eat before Jehovah thy God, in the place which he shall choose, to cause his name to dwell there, the tithe of thy grain, of thy new wine, and of thine oil, and the firstlings of thy herd and of thy flock; that thou mayest learn to fear Jehovah thy God always.