Genesis

But he rebelled against him in sending his ambassadors into Egypt, that they might give him horses and much people. Shall he prosper? shall he escape that doeth such things? or shall he break the covenant, and be delivered?

And he said, Cursed be Canaan; a servant of servants shall he be unto his brethren.

And he said, Blessed be the Lord God of Shem; and Canaan shall be his servant.

And when the servants of Hadarezer saw that they were put to the worse before Israel, they made peace with David, and became his servants: neither would the Syrians help the children of Ammon any more.