Exodus 12:38

12:38 A mixed multitude ¹  also went up with them, and flocks and herds – a very large number of cattle. ² 

Exodus 19:22

19:22 Let the priests also, who approach the Lord, sanctify themselves, lest the Lord break through ³  against them.”

[12:38]  ¹ tn The “mixed multitude” (עֵרֶב רַב, ’erev rav) refers to a great “swarm” (see a possible cognate in 8:21[17]) of folk who joined the Israelites, people who were impressed by the defeat of Egypt, who came to faith, or who just wanted to escape Egypt (maybe slaves or descendants of the Hyksos). The expression prepares for later references to riffraff who came along.

[12:38]  ² tn Heb “and very much cattle.”

[19:22]  ³ tn The verb יִפְרֹץ (yifrots) is the imperfect tense from פָּרַץ (parats, “to make a breach, to break through”). The image of Yahweh breaking forth on them means “work destruction” (see 2 Sam 6:8; S. R. Driver, Exodus, 174).