Exodus 7:9

καὶ ἐὰν λαλήσῃ πρὸς ὑμᾶς Φαραω λέγων δότε ἡμῖν σημεῖον ἢ τέρας καὶ ἐρεῖς Ααρων τῷ ἀδελφῷ σου λαβὲ τὴν ῥάβδον καὶ ῥῖψον αὐτὴν ἐπὶ τὴν γῆν ἐναντίον Φαραω καὶ ἐναντίον τῶν θεραπόντων αὐτοῦ καὶ ἔσται δράκων