And the mystery of the matter: (Gen. 1:6)... and He separated between the waters and the waters. about which it is stated: (Ex. 12:15)... but on the first day, you shall remove leaven from your houses... ‘... but (akh)... – serves to divide.’xlixBT Pesaḥim 5a
And He swore to eliminate them with His hand (yad, =14), which is the fourteenth day of the month of the Paschal sacrifice, to fulfil: (Mic. 7:15) Like the days of your going out from the land of Egypt, I shall show him wonders. [And this is the 7 days of Passover of the first exile, and the 7 days of Passover of the last exile] It is this that is written: (Num. 28:17)... a festival of seven days, unleavened bread shall be eaten.