Exodus 8:28

²⁸ καὶ ἐβάρυνεν φαραω τὴν καρδίαν αὐτοῦ καὶ ἐπὶ τοῦ καιροῦ τούτου καὶ οὐκ ἠθέλησεν ἐξαποστεῖλαι τὸν λαόν