Fausset's Bible Dictionary
Exodus 12:38, 'eereb raab; Numbers 11:4, hasaph suph; like our English "riff-raff," a mob gathered from various quarters; accompanied Israel at the Exodus from Egypt. All those not of pure Israelite blood. As at the return from Babylon (Nehemiah 13:1-3; Nehemiah 13:30) "they separated from Israel all the mixed multitude ... strangers." Probably among the mixed multitude at the Exodus were the remains of the Hyksos or followers of the shepherd kings who invaded from the N. and ruled Egypt, beginning with Salatis master of Avaris, Tanis, or Zoan, and ending with Apophis, their last king, expelled by Aahmes I the "new king that knew not Joseph." Hated in Egypt, they naturally emigrated with Israel (compare Josephus contra Apion, 1:14, section 26).
These files are public domain.
Fausset, Andrew R. Entry for 'Mixed Multitude'. Fausset's Bible Dictionary. https://www.studylight.org/​dictionaries/​eng/​fbd/​m/mixed-multitude.html. 1949.