Hebrews 7:4-6

4Now consider how great this man was: even Abraham the patriarch gave a tenth of the plunder to him.

5The sons of Levi who receive the priestly office have a command according to the law to collect a tenth from the people  — that is, from their brothers and sisters — though they have also descended from Abraham.

6But one without this lineage collected a tenth from Abraham and blessed the one who had the promises.