'Behalf' in the Bible

"Now you, Ezra, in keeping with the wisdom of your God which you possess, appoint judges and court officials who can arbitrate cases on behalf of all the people who are in Trans-Euphrates who know the laws of your God. Those who do not know this law should be taught.

So let's have our officials remain on behalf of the whole community. Then all who have married foreign wives are to come appear at specific times before the elders and judges of each city until the fierce anger of our God has been turned away from us in this matter."