Numbers 33:3

3 They departed from Rameses a in the first month, on the fifteenth day of the month. On the day after the
Passover: The Israelite festival celebrated on the fourteenth day of the first month in the early spring. It was a celebration of the deliverance of the Israelites from Egypt, commemorating the final plague on Egypt when the firstborn were killed.
Passover c the Israelites went out triumphantly
Lit with a raised hand; Ex 14:8
,
e in the sight of all the Egyptians.
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