The Targum Pseudo-Jonathan on Exodus 14:3 drops two shocking names into the Egyptian court. Pharaoh needs intelligence on the escaping Hebrews. Who gives it to him? Dathan and Abiram—"sons of Israel, who had remained in Mizraim."
These are the same Dathan and Abiram who will later lead the rebellion against Moses (Numbers 16). The Targum gives them a long history of betrayal. They did not leave with Israel on the night of Passover. They stayed in Egypt, collaborators, and fed Pharaoh the information he needed to chase the freed slaves.
The report they deliver is chilling in its irony: "The people of the house of Israel are bewildered in the land: the idol Zephon hath shut them in close upon the desert." The Jewish informers attribute their brothers' predicament to an Egyptian god. They have internalized the worldview of the master so completely that they explain their own kin's suffering in Egyptian theological categories.
The Targum is making a quiet argument about assimilation. Four hundred years of bondage produced not only freed slaves but also house slaves who preferred the master's gods to their own. When redemption came, they refused to follow—and then they hunted their brothers.
Takeaway: the Targum teaches that the most dangerous enemies of a freed people are often those who did not want to be freed.