Matthew 27:66

σφραγίσαντες. ‘The sealing was by means of a cord or string passing across the stone at the mouth of the sepulchre and fastened at either end to the rock by sealing clay’ (Alford). Cp. Daniel 6:17 : καὶ ἐσφραγίσατο ὁ βασιλεὺς ἐν τῷ δακτυλίῳ αὐτοῦ καὶ ἐν τῷ δακτυλίῳ τῶν μεγιστάνων αὐτοῦ (sc. τὸν λίθον ὃν ἐπέθηκαν ἐπὶ τὸ στὸμα τοῦ λάκκου).

σφραγίζειν is used in various figurative senses, all more or less nearly connected with this literal signification. See John 3:33 and 2 Corinthians 1:2, ‘certify.’ Ephesians 1:13; Ephesians 4:30, ‘assure.’ Romans 15:28, ‘secure,’ ‘authenticate.’ Revelation 10:4; Revelation 22:10, ‘conceal.’ In Ecclesiastical Greek it is used of making the sign of the Cross in baptism and other rites.