And smote all the firstborn in Egypt; the chief of [their] strength in the tabernacles of Ham:
Ver. 51. And smote all the firstborn in Egypt] Certo pestis genere perniciocissimo et acutissimo. The Rabbis say that in each house was a dead corpse, viz. the chieftain of the family, whether there were a firstborn in it or not, Exodus 12:30 .
In the tabernacle of Ham] Who was the father of Mizraim, the founder of the Egyptians, Genesis 10:6, who vainly boasted that they were αυτοχθονες, as ancient as their land. Herodotus, the author of that story, tells us also of a certain great town in Egypt called Chemmim, from Cham likely.