Kabbalah sur L’Exode 12:38
וְגַם־עֵ֥רֶב רַ֖ב עָלָ֣ה אִתָּ֑ם וְצֹ֣אן וּבָקָ֔ר מִקְנֶ֖ה כָּבֵ֥ד מְאֹֽד׃
De plus, une tourbe nombreuse les avait suivis, ainsi que du menu et du gros bétail en troupeaux très considérables.
Zohar
Erev/night - as you say "and also an erev rav went up with them" (Ex. 12:38), since all those pure travails are the ones that mix [mit'arev] with the forces of the night. And this is why there is no obligation regarding the night prayer, because no person can say it like Ya'akov, who was the master of the dwelling, and was the [only] one who could say it properly.
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