Egyptian texts about the Pharaoh speak about his power as his strong hand; he destroys enemies with his arm. Here God says his hand will defeat the Pharaoh. As is written in Psalm 2:4–5: He who sits in the heaven laughs; the Lord holds them in derision. Then he will speak to them in his wrath, and terrify them in his fury.
20 J'étendrai ma main, et je frapperai l'Egypte par toutes sortes de prodiges que je ferai au milieu d'elle. Après quoi, il vous laissera aller.