https://en.wikipedia.org/wiki/Erev_Rav

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Erev Rav (Hebrew: עֵרֶב רַב erev rav 'mixed multitude') was a group that included Egyptians and others who had joined the Tribes of Israel on The Exodus. According to Jewish tradition, they were accepted by Moses as an integral part of the people. Their influence is said to have been involved in the golden calf and other incidents where the people questioned Moses and his laws.