'Pledges' in the Bible

and hath taken all the gold and the silver, and all the vessels that are found in the house of Jehovah, and in the treasures of the house of the king, and the sons of the pledges, and turneth back to Samaria.

and taketh all the gold, and the silver, and all the vessels that are found in the house of God with Obed-Edom, and the treasures of the house of the king, and the sons of the pledges, and turneth back to Samaria.

Do not these -- all of them -- against him a simile taken up, And a moral of acute sayings for him, And say, Woe to him who is multiplying what is not his? Till when also is he multiplying to himself heavy pledges?