Ἰδὼν δὲ Φαραὼ ὅτι γέγονεν ἀνάψυξις, ἐβαρύνθη ἡ καρδία αὐτοῦ, καὶ οὐκ εἰσήκουσεν αὐτῶν, καθάπερ ἐλάλησεν Κύριος.
But when Pharao saw that there was a respite, his heart was heavy, and he did not listen to them, just as the LORD spoke.
8:11
וירא פרעה כי היתה הרוחה והכבד את־לבו ולא שׁמע אלהם כאשׁר דבר יהוה׃
* respite OR relief
* heavy OR hardened
Exodus 8:15 in Septuagint = Exodus 8:11 in the Hebrew Bible