Exodus 31:17

ἐν ἐμοὶ καὶ τοῖς υἱοῖς Ισραηλ σημεῖόν ἐστιν αἰώνιον ὅτι ἐν ἓξ ἡμέραις ἐποίησεν κύριος τὸν οὐρανὸν καὶ τὴν γῆν καὶ τῇ ἡμέρᾳ τῇ ἑβδόμῃ ἐπαύσατο καὶ κατέπαυσεν