Hebrews 7:4

7:4 But see how great he must be, if Abraham the patriarch gave him a tithe of his plunder.

Genesis 14:19-20

14:19 He blessed Abram, saying,

“Blessed be Abram by the Most High God,

Creator of heaven and earth.

14:20 Worthy of praise is the Most High God,

who delivered your enemies into your hand.”

Abram gave Melchizedek a tenth of everything.