וַיֹּאמְר֤וּ הַֽחַרְטֻמִּים֙ אֶל־פַּרְעֹ֔ה אֶצְבַּ֥ע אֱלֹהִ֖ים הִ֑וא וַיֶּחֱזַ֤ק לֵב־פַּרְעֹה֙ וְלֹֽא־שָׁמַ֣ע אֲלֵהֶ֔ם כַּאֲשֶׁ֖ר דִּבֶּ֥ר יְהוָֽה׃ (ס)
Then the magicians said unto Pharaoh: ‘This is the finger of God’; and Pharaoh’s heart was hardened, and he hearkened not unto them; as the LORD had spoken.
Find Mishnaic references to Exodus 8:15: , passages from the 63 tractates of the Mishnah.