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)
2 Corinthians 6:14
14
Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness?
