Brimstone and salt
In Deuteronomy 29:33, this signifies the vastation of good and truth, for these destroy the earth and its produce as lusts destroy goods and falsities destroy truths. (Arcana Coelestia 1666)
Arcana Coelestia #5543
5543. 'If I do not bring him back to you' means if no joining of the intermediary takes place. This is clear from the representation of Benjamin, to whom the one he would bring back refers here, as the intermediary, dealt with in 5411, 5413, 5443, 5539; and from the meaning of 'bringing back' as being joined.