'Descendants Of Abraham' in the Bible

For, as we all know, He (Christ) does not take hold of [the fallen] angels [to give them a helping hand], but He does take hold of [the fallen] descendants of Abraham [extending to them His hand of deliverance].

The descendants of Levi who accept the priesthood have a commandment in the Law to collect a tenth from the people, that is, from their own brothers, even though they are also descendants of Abraham.