וַיַּֽעֲשׂוּ־כֵ֛ן חַרְטֻמֵּ֥י מִצְרַ֖יִם בְּלָטֵיהֶ֑ם וַיֶּחֱזַ֤ק לֵב־פַּרְעֹה֙ וְלֹא־שָׁמַ֣ע אֲלֵהֶ֔ם כַּאֲשֶׁ֖ר דִּבֶּ֥ר יְהוָֽה׃
And the magicians of Egypt did in like manner with their secret arts; and Pharaoh’s heart was hardened, and he hearkened not unto them; as the LORD had spoken.
Read halakhic rulings (Jewish law) on Exodus 7:22 from the Mishneh Torah and classical halakhic sources, free online.