'For Us' in the Bible

And the children of Israel said to Samuel, Go on crying to the Lord our God for us to make us safe from the hands of the Philistines.

And all the people said to Samuel, Make prayer for us to the Lord your God so that death may not overtake us: for in addition to all our sins we have done this evil, in desiring a king.

If he is able to have a fight with me and overcome me, then we will be your servants: but if I am able to overcome him, then you will be our servants and do work for us.