The severity of this judgment compelled Pharaoh and the Egyptians, who had previously resisted releasing the Hebrews, to urgently expedite their departure and to generously offer them valuables to ensure their swift exit. The Israelites, having been prepared, gathered in Ramesses, the principal city of Goshen, numbering six hundred thousand men, excluding women and children, and then proceeded in organized ranks towards the Red Sea. Their initial encampment was at 'Sokhof', a place named after the temporary shelters the Hebrews used during their stay. This occurred on the fifteenth day of the newly established ecclesiastical month of ‘Abib’.
On the same day, while still at Sokhof, the Lord sought to solidify the memory of the Hebrews' deliverance from the devastations of the destroying angel, which marked the end of their Egyptian bondage, by instituting the law of firstborn sanctification. He commanded Moses to consecrate every firstborn that opens the womb among the children of Israel, instructing him to declare to the people that they should set apart their firstborn for sacred purposes in His honor. This command encompasses the firstborn among the Israelites, including both human and animal life, specifically the firstborn of the mother, rather than the father, who may have had a prior wife or multiple wives. The firstborn signifies the primary child of a mother who was not baptized, as well as the firstborn male in general. Autonomously, the firstborn son, regarded as the first fruits of a father's vigor, holds a special status in inheritance—receiving a greater share and authority over siblings upon the father's death—yet, in the realm of sanctification, it is the firstborn of the mother who takes precedence unless that same child is also the firstborn of the father. Hence, if a man were to have two wives, the firstborn from each would be consecrated to God. The exact sacred purpose of the firstborn will be discussed further.