'Behalf' in the Bible

Then I will call Uriah the priest and Jeberechiah's son Zechariah as reliable witnesses to testify on my behalf."

"So when they advise you, "Ask the mediums your questions, and quiz the spiritists who chirp and mutter,' shouldn't a people instead be consulting their God and not the dead on behalf of those who are living

Since ancient times no one has heard, and no ear has perceived, and no eye has seen any God besides you, who acts on behalf of those who wait for him.