'Heave offering' in the Bible

Then there shall be a place which the LORD your God shall choose to cause his name to dwell there; thither shall ye bring all that I command you; your burnt-offerings, and your sacrifices, your tithes, and the heave-offering of your hand, and all your choice vows which ye vow to the LORD:

Thou mayest not eat within thy gates the tithe of thy corn, or of thy wine, or of thy oil, or the firstlings of thy herds or of thy flock, nor any of thy vows which thou vowest, nor thy free-will-offerings, or heave-offering of thy hand: