'Pray for' in the Bible

And Samuel said, Gather all Israel to Mizpah, and I will pray for you to LORD.

And all the people said to Samuel, Pray for thy servants to LORD thy God that we not die, for we have added to all our sins [this] evil, to ask a king for us.

Moreover as for me, far be it from me that I should sin against LORD in ceasing to pray for you. But I will instruct you in the good and the right way.