FIRST OR LAST TENTH?
You tithe on crops, and every tenth animal that passes under the rod. NOT the first, but the tenth. See Leviticus 27:30-33.
Preachers are mixing firstfruits with the tithe and they are NOT the same. In Nehemiah 10:37-38 we learn that the firstfruits were taken to the temple for the priests, and the tithe was taken to the Levites to go into their cities.