In Genesis 4:23, this signifies to extinguish faith. (Arcana Coelestia 427)

'The slain of Jehovah' signify people who turn truths into falsities, which causes them to perish.

'The slain,' in Lamentations 2:12 signify people who do not know what the truths of faith mean.

'The slain' when referring to the Lord in Revelation 5 means the separation of everything from the divine. In denial of His divinity, He is spiritually slain to people and this denial causes a state of separation from Him.

(Izinkomba: Lamentations 2; The Apocalypse Explained 828)

1831. 'And he laid each part opposite the other' means a parallelism and correspondence as regards celestial things. This becomes clear from the fact that the parts on one side mean the Church and those on the other the Lord. And when these are set in their proper places opposite each other, nothing else is meant than parallelism and correspondence. And because the heifer, the she-goat, and the ram, which mean celestial things, as stated just above at verse 9, were cut in half as described and laid in their proper places, it is clear that there is a parallelism and correspondence as regards celestial things. As regards spiritual things however, which will be dealt with shortly, the situation is different. As often stated, celestial things are all those that have to do with love to the Lord and love towards the neighbour. It is the Lord who imparts love and charity, the Church that receives; and that which unites is conscience, which has love and charity implanted within it. Consequently the space in between the parts means those things present in man which are called perception, internal dictate, and conscience. The things that exist above that perception, dictate, and conscience are the Lord's, those that are below reside in man. Thus because these things above and those below look towards one another, a parallelism is said to exist; and because they correspond to one another, as active and passive, a correspondence is said to exist.