וְהִשְׁמִ֤יעוּ עָלַ֙יִךְ֙ בְּקוֹלָ֔ם וְיִזְעֲק֖וּ מָרָ֑ה וְיַעֲל֤וּ עָֽפָר֙ עַל־רָ֣אשֵׁיהֶ֔ם בָּאֵ֖פֶר יִתְפַּלָּֽשׁוּ׃
And shall cause their voice to be heard over thee, And shall cry bitterly, And shall cast up dust upon their heads, They shall roll themselves in the ashes;
Pirkei DeRabbi Eliezer
Rabbi José said: All that night the Israelites were eating and drinking, rejoicing and taking wine and praising their God with a loud voice, whilst the Egyptians were crying with a bitter soul, because of the plague which came upon them suddenly, as it is said, "And there was a great cry in Egypt; for there was not a house where there was not one dead" (Ex. 12:80).