Arcana Coelestia #8184
8184. 'Divide it' means dispersing falsity from there. This is clear from the meaning of 'dividing that sea' as dispersing the falsities arising from evil that are present in that hell; for the falsities there are seen as waters, in keeping with what has been shown above in 8099, 8137, 8148. When the pillar of angels in which the Lord is present passes through that hell the falsities depart, and as a consequence the waters there, which are the falsities, are parted asunder. From this it is evident that 'dividing the sea' means dispersing the falsities belonging to the hell that is represented by 'the Sea Suph'.
Arcana Coelestia #8205
8205. 'And the children of Israel came into the middle of the sea on dry ground' means the entrance into hell by those who belonged to the spiritual Church and their passage through it in safety and without falsity flowing in. This is clear from the explanation above in 8185, where similar words occur.