Gen

Gen 14:18-20

18 Melchizedek, king of Salem, brought out bread and wine — he was priest of The High God —   19 and blessed him:  Blessed be Abram by The High God, Creator of Heaven and Earth. 20 And blessed be The High God, who handed your enemies over to you. Abram gave him a tenth of all the recovered plunder.   

This is also written in the New Testament!