The destruction of Sodom and Gomorrah shows God's severe judgment of sin. This is evident in both the Old Testament (Deuteronomy 29:23; Isaiah 1:9; Jeremiah 23:14; Amos 4:11) and the New Testament (Luke 10:12; Romans 9:29; 2 Peter 2:6).
salt pits: These are areas of ruin (Deuteronomy 29:23; Psalm 107:34; Jeremiah 17:6). Sowing the earth with salt was a sign of permanent judgment (see Judges 9:45) because it made the ground infertile.