Commentaries:
Jamieson, Fausset, and Brown
The Lord sent fiery serpents among the people—That part of the desert where the Israelites now were—near the head of the gulf of Akaba—is greatly infested with venomous reptiles, of various kinds, particularly lizards, which raise themselves in the air and swing themselves from branches; and scorpions, which, being in the habit of lying in long grass, are particularly dangerous to the barelegged, sandaled people of the East. The only known remedy consists in sucking the wound, or, in the case of cattle, in the application of ammonia. The exact species of serpents that caused so great mortality among the Israelites cannot be ascertained. They are said to have been "fiery," an epithet applied to them either from their bright, vivid color, or the violent inflammation their bite occasioned.
Other Jamieson, Fausset, and Brown entries containing Numbers 21:6:
2 Kings 18:4
Isaiah 6:2
1 Corinthians 15:55
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