'Behalf' in the Bible

When the people [instead of trusting God] say to you, “Consult the mediums [who try to talk to the dead] and the soothsayers who chirp and whisper and mutter,” should not a people consult their God? Should they consult the dead on behalf of the living?

He saw that there was no man,And was amazed that there was no one to intercede [on behalf of truth and right];Therefore His own arm brought salvation to Him,And His own righteousness sustained Him.

For from days of old no one has heard, nor has ear perceived,Nor has the eye seen a God besides You,Who works and acts in behalf of the one who [gladly] waits for Him.