8017. 'And so it was on this same day' means a state of the Lord's presence. This is clear from the meaning of 'day' as a period of time and a state, dealt with in 23, 487, 488, 493, 893, 2788, 3462, 3785, 4850, 7680. The reason why a state of the Lord's presence is meant is that it was Passover day, and 'the Passover' means the Lord's presence and the deliverance of those belonging to the spiritual Church from spiritual captivity and from damnation, 7867. Deliverance then is meant by what this verse goes on to say, namely that on that day Jehovah brought the children of Israel out of the land of Egypt by their hosts. The fact that this was on the day after the Passover is clear in Moses,

They set out from Egypt on the fifteenth day of the first month, on the day after the Passover, in the sight ¹ of all the Egyptians, at the time that the Egyptians were burying the firstborn who had been killed. Numbers 33:3-4.

The Lord's presence delivers from damnation those who are governed by good, and brings to damnation those who are ruled by evil, see 7926, 7989.

V:

7828. 'The first shall it be for you in the months of the year' means the starting point of all states following for evermore. This is clear from the meaning of 'being the first', when used in reference to months of the year and in the internal sense to states of life, as the starting point; from the meaning of 'the months' as states, dealt with immediately above in 7827; and from the meaning of 'the year' as the period of life from start to finish, dealt with in 2906. Here, since it is speaking about members of the spiritual Church in the next life, whose period of life has a starting point but no finish, 'the year' means the period of life from the start and continuing for evermore (as 'year' can also mean, see end of 2906). The reason why this month became 'the head of months' and the first of all is that it means the starting point in the deliverance of those belonging to the spiritual Church who till then were in a state of captivity, since they were held back on the lower earth, where they were molested by the evil ones represented by Pharaoh and the Egyptians. The reason why their first state when they were delivered is the chief one of all and why it is the starting point of all following for evermore is that those who were there were delivered by the Lord's Coming into the world. They could not possibly have been saved without the Lord's Coming into the world; and their deliverance took place when the Lord rose again. From this it is evident that that state - when they were delivered - was for them the chief of all states. It was to be the same after that for all who belonged to the spiritual Church. They too could not have been saved unless the Lord had come into the world and glorified His Human, that is, made it Divine. With regard to those who belonged to the spiritual Church before the Lord's Coming, that they were held back on the lower earth, and that the Lord delivered and saved them, see 6854, 6914; and in general, that members of the spiritual Church were saved by the Lord's Coming, 2661, 1716, 6372, 7035, 7091 (end). So it is that the words under consideration here mean in the highest sense that the glorification and resurrection of the Lord, of His Human, are the source of all salvation.