וַיָּ֨קָם פַּרְעֹ֜ה לַ֗יְלָה ה֤וּא וְכָל־עֲבָדָיו֙ וְכָל־מִצְרַ֔יִם וַתְּהִ֛י צְעָקָ֥ה גְדֹלָ֖ה בְּמִצְרָ֑יִם כִּֽי־אֵ֣ין בַּ֔יִת אֲשֶׁ֥ר אֵֽין־שָׁ֖ם מֵֽת׃
And Pharaoh rose up in the night, he, and all his servants, and all the Egyptians; and there was a great cry in Egypt; for there was not a house where there was not one dead.
Read halakhic rulings (Jewish law) on Exodus 12:30: and classical halakhic sources.