ACT 7:8

8 And he gave to him the testament of circumcision; and so he engendered Isaac, and circumcised him in the eighth day. And Isaac engendered Jacob, and Jacob engendered the twelve patriarchs. (And he gave to him the covenant of circumcision; and so he begat Isaac, and circumcised him on the eighth day. And Isaac begat Jacob, and Jacob begat the twelve patriarchs.)