In Genesis 14:17, this signifies the liberation and vindication of the apparent good and truth represented by Abram here. (Arcana Coelestia 1722)

In Zechariah 11:4, this signifies people who are in good but led astray by falsities of doctrine. (Apocalypse Explained 315[11])

In Isaiah 30:25, this signifies the Last Judgment when the wicked perish spiritually. (Apocalypse Explained 315[15])

'Slaughter' signifies perdition and damnation. 'Slaughter' and 'a storm of slaughter,' signifies evils which destroy the goods of the church. 'The day of great slaughter' stands for the last judgment.

(Odkazy: Apocalypse Explained 315)

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.