Albert Barnes Commentary Matthew 10:15

"Verily I say unto you, It shall be more tolerable for the land of Sodom and Gomorrah in the day of judgment, than for that city." — Matthew 10:15 (ASV)

It shall be more tolerable for Sodom, etc. The cities here mentioned, together with Admah and Zeboim, were destroyed by fire and brimstone, or by a volcanic eruption, on account of their great wickedness. They occupied the place afterwards covered by the Dead Sea, bounding Palestine on the south-east (Genesis 19:24–25).

Christ said that their punishment will be more tolerable—that is, more easily borne—than that of the people who reject His gospel. The reason is that they were not favoured with so much light and instruction (Luke 12:47–48).

Sodom and Gomorrah are often referred to as signal instances of Divine vengeance, and as sure proofs that the wicked shall not go unpunished (2 Peter 2:6; Jude 1:7).