Strong H3581B כֹּחַ kôach kôach · strength

Ecclesiastes

1. Ecclesiastes 4:1
   So I returned, and considered all the oppressions that are done under the sun: and behold the tears of such as were oppressed, and they had no comforter; and on the side of their oppressors there was power; but they had no comforter.
2. Ecclesiastes 9:10
   Whatsoever thy hand findeth to do, do it with thy might; for there is no work, nor device, nor knowledge, nor wisdom, in the grave, whither thou goest.