'Behalf' in the Bible

For when a native Israeli or a resident alien abandons me to set up idols in his heart behind my back, and then places the stumbling block of his iniquity right in front of his own face, then approaches a prophet to inquire of me on behalf of his own self-interest, I, the LORD will answer him myself.

I sought for a man among them to build the wall and stand in the breach in my presence on behalf of the land so that it won't be destroyed, but I found no one,

They are not to come in contact with a dead body, so they don't defile themselves, except in the case of their father, mother, son, daughter, brother, or for an unmarried sister, on whose behalf they may defile themselves.