Commento su Esodo 12:51

AND IT CAME TO PASS THE SELFSAME DAY THE ETERNAL DID BRING THE CHILDREN OF ISRAEL OUT OF THE LAND OF EGYPT. Since Scripture said above, It was a night of watching unto the Eternal for bringing them out of the land of Egypt,³⁶¹Above, Verse 42. it reverted and explained that they did not go out at all of the land then, but that Pharaoh gave them permission [at night] to go out, and thus they became free men. Instead, it was in the glare of full daylight that they went out from all the borders of Egypt with all their hosts — the hosts of women and the mixed multitude³⁶²Ibid., Verse 38. that attached themselves to them.
Rabbi Abraham ibn Ezra explained the purport of the verse as follows: “And it came to pass the selfsame day that the Eternal did bring the children of Israel out of the land of Egypt that He spoke to Moses, saying, Sanctify unto Me.”³⁶³Further, 13:2. Thus according to Ibn Ezra, the verse before us is to be joined to the following chapter.

ויהי בעצם היום הזה, It was on the self-same day, etc. The reason the Torah records the Exodus immediately after concluding the legislation of the Passover ceremonies is to remind us that the fulfilment of this מצוה is what triggered the redemption from Egypt. The Israelites had no other credentials than performance of this commandment.

'ויהי בעצם היום הזה וגו, although this has been mentioned once, it is repeated because G’d gave instructions to Moses concerning the sanctifying of the Jewish firstborn forthwith on the very day the Exodus took place.