Arcana Coelestia #487
487. 'Days means periods of time and states in general. This has been shown in Chapter 1, where the 'days of creation' have no other meaning. In the Word it is very common for a whole period of time to be called 'a day', as it clearly is in the present verse and in verses 5, 8, 11, 14, 17, 20, 23, 27, 31, below; and therefore the states that belong to periods of time in general are meant by 'days' as well. And when 'years' is attached, then periods of years mean the natures of those states, and so the states in particular.
[2] The most ancient people had their own particular numbers which they would use to mean different aspects of the Church - for instance, the numbers three, seven, ten, twelve, and many which they obtained from these and other numbers - and in so doing incorporated states of the Church. These numbers therefore contain arcana that would require considerable effort to unravel. Really a number was an evaluation of the states of the Church. The same feature occurs throughout the Word, especially in the prophetical. And the religious ceremonies of the Jewish Church also entail numbers specifying periods of time as well as quantities; for example, in connection with sacrifices, minchahs, oblations, and other practices, which in every case have special reference to holy things. Consequently eight hundred in this verse, nine hundred and thirty in the next, and the numbers of years mentioned in the verses that follow after that, embody in particular more matters than can possibly be retold; matters, that is to say, which have to do with changes in the state of their Church in relationship to their own general state. Later on, in the Lord's Divine mercy, the meaning of the simple numbers up to twelve will be given, for without knowing these first of all no one can grasp what compound numbers mean.
Joshua 3:11-17
11
Behold, the ark of the covenant of the Lord of all the earth passes over before you into the Jordan.
12
Now therefore take twelve men out of the tribes of Israel, for every tribe a man.
13
It shall come to pass, when the soles of the feet of the priests who bear the ark of Yahweh, the Lord of all the earth, rest in the waters of the Jordan, that the waters of the Jordan will be cut off, even the waters that come down from above; and they shall stand in one heap."
14
It happened, when the people moved from their tents to pass over the Jordan, the priests who bore the ark of the covenant being before the people,
15
and when those who bore the ark had come to the Jordan, and the feet of the priests who bore the ark had dipped in the edge of the water (for the Jordan overflows all its banks all the time of harvest),
16
that the waters which came down from above stood, and rose up in one heap, a great way off, at Adam, the city that is beside Zarethan; and those that went down toward the sea of the Arabah, even the Salt sea, were wholly cut off. Then the people passed over right against Jericho.
17
The priests who bore the ark of the covenant of Yahweh stood firm on dry ground in the middle of the Jordan; and all Israel passed over on dry ground, until all the nation had passed completely over the Jordan.
