Isaiah14:15,19Down to hell to the sides of the pit

¹⁵ Yet thou shalt be brought down to hell, to the sides of the pit.
¹⁹ But thou art cast out of thy grave like an abominable branch, and as the raiment of those that are slain, thrust through with a sword, that go down to the stones of the pit; as a carcase trodden under feet. -Isaiah 14:15,19 King James Version (KJV)

Arcana Coelestia, by Emanuel Swedenborg, [1749-56], tr. by John F. Potts [1905-10], at sacred-texts.com

4728.

...men who have been in principles of falsity are after death kept awhile under the lower earth, until falsities have been removed from them... The lower earth is next under the feet [of heaven which is in the form of a Grand Man] and the region round about for a short distance. Here are most persons after death, before they are taken up into heaven. This [lower] earth is also frequently mentioned in the Word. Beneath it are the places of vastation, which are called "pits," and below them and round about for a considerable extent, are hells. [2] From this it is in some measure plain what is meant by "hell," what by the "lower earth," and what by a "pit," when mentioned in the Word, as in Isaiah: Thou hast been brought down to hell, to the sides of the pit. Thou hast been cast forth out of thy grave like an abominable shoot, the raiment of those that are slain, thrust through with the sword, that go down to the stones of the pit (Isa. 14:15, 19); speaking of the king of Babylon, by whom is represented the profanation of truth; for a "king" is truth (n. 1672, 2015, 2069, 3009, 4581), and "Babylon" profanation (n. 1182, 1326). "Hell" is where the damned are, and their damnation is compared to an abominable shoot, and to the raiment of those that are slain and thrust through with the sword, that go down to the stones of the pit. The "raiment of those that are slain" is truth profaned; "those thrust through with the sword" are they in whom truth has been extinguished; the "pit" is falsity which must be vastated; "stones" are the borders, whence also they are called the "sides," for round about the pits are hells... From this it is also plain that without the internal sense it could not possibly be known what is here meant. [3] So too in Ezekiel: When I shall bring thee down with them that descend into the pit, to the people of an age, and shall make thee to dwell in the earth of the lower regions, in desolations from an age, that thou dwell not with them that go down into the pit; then will I set adornment in the land of the living (Ezek. 26:20); "they that descend into the pit" denote those who are sent into vastation; "not to dwell with them that go down into the pit" means to be delivered from falsities.