The leech has two daughters: Give and Give. Three things are never satisfied; four never say, “Enough”:
He had spoken before of those that devoured the poor (Pro 30:14), and had spoken of them last, as the worst of all the four generations there mentioned; now here he speaks of their insatiableness in doing this. The temper that puts them upon it is made up of cruelty and covetousness.
Commenting on Proverbs 30:15-17
The horse leech hath two daughters, crying, Give, give,.... Or "the blood sucker" (l); so it began to be called in the times of Pliny (m), to which the last generation of men may well be compared; blood thirsty creatures, that never have enough, and are not satisfied with the flesh of men, nor with their blood; and such particularly the Papists are: and not...
horse leech--supposed by some to be the vampire (a fabulous creature), as being literally insatiable; but the other subjects mentioned must be taken as this, comparatively insatiable. The use of a fabulous creature agreeably to popular notions is not inconsistent with inspiration. There are three . . . yea, four--(Compare Pro 6:16).