וַיַּעֲשׂוּ־כֵ֨ן הַחַרְטֻמִּ֧ים בְּלָטֵיהֶ֛ם לְהוֹצִ֥יא אֶת־הַכִּנִּ֖ים וְלֹ֣א יָכֹ֑לוּ וַתְּהִי֙ הַכִּנָּ֔ם בָּאָדָ֖ם וּבַבְּהֵמָֽה׃
And the magicians did so with their secret arts to bring forth gnats, but they could not; and there were gnats upon man, and upon beast.
Read kabbalistic (mystical) interpretation of Exodus 8:14: and classical mystical sources.