Exodus 23:28

I will send hornets before thee - הצרעה hatstsirah. The root is not found in Hebrew, but it may be the same with the Arabic saraa, to lay prostrate, to strike down; the hornet, probably so called from the destruction occasioned by the violence of its sting. The hornet, in natural history, belongs to the species crabro, of the genus vespa or wasp; it is a most voracious insect, and is exceedingly strong for its size, which is generally an inch in length, though I have seen some an inch and a half long, and so strong that, having caught one in a small pair of forceps, it repeatedly escaped by using violent contortions, so that at last I was obliged to abandon all hopes of securing it alive, which I wished to have done. How distressing and destructive a multitude of these might be, any person may conjecture; even the bees of one hive would be sufficient to sting a thousand men to madness, but how much worse must wasps and hornets be! No armor, no weapons, could avail against these. A few thousands of them would be quite sufficient to throw the best disciplined army into confusion and rout. From Joshua 24:12, we find that two kings of the Amorites were actually driven out of the land by these hornets, so that the Israelites were not obliged to use either sword or bow in the conquest.

Hornets - Compare the marginal references. The word is used figuratively for a cause of terror and discouragement. Bees are spoken of in the like sense, Deuteronomy 1:44; Psalm 118:12.