Moses, with Aaron, returned to Egypt, confronted the Pharaoh, and did exactly what the Lord had commanded them to do. And for a time it made things much, much worse (Exodus 5:6-19). Even their Israelite kinsmen confronted them angrily (Exodus 5:20-21).
The illusion that perfectly obeying the will of God always leads to good things is rife among believers, but is not Biblical. Moses felt regret, but God was just getting started.
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