According to Jewish tradition, members of the tribe of Ephraim attempted to leave Egypt prematurely, 30 years before the actual Exodus led by Moses12. This event is not described in the Torah itself, but is mentioned in various midrashic and rabbinic sources.

The Ephraimites miscalculated the end of the 400 years of exile that God had foretold to Abraham2. They counted from the time of the prophecy itself, rather than from the birth of Isaac 30 years later, which was the correct starting point26.

This premature exodus attempt occurred without consulting Moses or divine instruction. The Ephraimites acted on their own initiative, likely motivated by a desire to end their suffering and return to Canaan3. However, their unauthorized departure was seen as a transgression against God's decree2.

The attempt ended in tragedy, with the Philistines killing large numbers of the Ephraimites who had left Egypt early12. Various sources give different figures for the casualties, ranging from 180,000 to 300,00013.

This failed exodus attempt is sometimes interpreted as foreshadowing the role of Ephraim's descendants in the future messianic redemption610. Just as they tried to bring redemption early in Egypt, the Messiah from the tribe of Ephraim (Mashiach ben Yosef) is expected to precede the final Messiah from the tribe of Judah (Mashiach ben David)610.

The story serves as a cautionary tale about the dangers of trying to force redemption before its divinely appointed time, and highlights the importance of following proper leadership and divine guidance in matters of national destiny.