'Bought' in the Bible

I said to them, “According to our ability we have redeemed (purchased back) our Jewish brothers who were sold to the [Gentile] nations; now would you even sell your brothers, that they might be sold to us?” Then they were silent and could not find a [single] word to say.

I also applied myself to the work on this wall; we did not buy any land, and all my servants were gathered together there for the work.