וַאֲנִ֥י אַקְשֶׁ֖ה אֶת־לֵ֣ב פַּרְעֹ֑ה וְהִרְבֵּיתִ֧י אֶת־אֹתֹתַ֛י וְאֶת־מוֹפְתַ֖י בְּאֶ֥רֶץ מִצְרָֽיִם׃
And I will harden Pharaoh’s heart, and multiply My signs and My wonders in the land of Egypt.
Read halakhic rulings (Jewish law) on Exodus 7:3 from the Mishneh Torah and classical halakhic sources, free online.