'Behalf' in the Bible

When they say to you, “Consult the mediums and the spiritists who whisper and mutter,” should not a people consult their God? Should they consult the dead on behalf of the living?

For from days of old they have not heard or perceived by ear,Nor has the eye seen a God besides You,Who acts in behalf of the one who waits for Him.

Thus says the Lord,“As the new wine is found in the cluster,And one says, ‘Do not destroy it, for there is benefit in it,’So I will act on behalf of My servantsIn order not to destroy all of them.