Targum su Esodo 10:29

And Mosheh said, Thou hast spoken fairly. While I was dwelling in Midian, it was told me in a word from before the Lord, that the men who had sought to kill me had fallen from their means, and were reckoned with the dead. At the end there will be no mercy upon thee; but I will pray, and the plague shall be restrained from thee. And now I will see thy face no more.

And Mosheh said, Thou hast spoken truly. But it was certified to me at the former time when I dwelt in Midian, that all the men were dead who sought to kill my life. At the end there will be no mercy upon thee. Yet I will pray for thee, and this plague shall be restrained. But a tenth plague is for Pharoh, of (which the victim will be) thy firstborn son. And Mosheh said to him, Thou hast spoken fairly the truth: I will see thy face no more.