And when eight days were accomplished for the circumcising of the child, his name was called JESUS, which was so named of the angel before he was conceived in the womb.  Luke 2, 21

Troparion

Thou Who sittest with the Father on a fiery throne in the heights  wast pleased to be born of a Virgin through the Divine Spirit on earth. Wherefore Thou wast circumcised as a man on the eighth day. Glory to Thine all-gracious will; glory to Thy providence; glory to Thy condescension, O only Lover of mankind.