שָׁלַ֤ח ׀ אֹת֣וֹת וּ֭מֹפְתִים בְּתוֹכֵ֣כִי מִצְרָ֑יִם בְּ֝פַרְעֹ֗ה וּבְכָל־עֲבָדָֽיו׃
He sent signs and wonders into the midst of thee, O Egypt, Upon Pharaoh, and upon all his servants.
Read kabbalistic (mystical) interpretation of Psalms 135:9: and classical mystical sources.