Hebrews 7:4-6

Riverside(i) 4 But see how great this man was, since Abraham the patriarch gave him a tenth of his choicest spoils. 5 And even those of the sons of Levi who attain the priesthood have command according to the Law to take a tenth from the people, their own brethren, although these have sprung from the loins of Abraham. 6 But he who had no genealogy from these took a tenth from Abraham and pronounced a blessing on him who had the promises.