Hebrews 7:4-6

New International Version - UK

⁴ Just think how great he was: even the patriarch Abraham gave him a tenth of the plunder! ⁵ Now the law requires the descendants of Levi who become priests to collect a tenth from the people – that is, from their fellow Israelites – even though they also are descended from Abraham. ⁶ This man, however, did not trace his descent from Levi, yet he collected a tenth from Abraham and blessed him who had the promises.