The chief of their strength; another expression noting the first-born, who are so called, Genesis 49:3. Of Ham; of the Egyptians, the posterity of Ham, Genesis 10:6; which title he there gives them, to intimate that they were the cursed children of a cursed parent, Ham, Genesis 9:25, and therefore were proper objects for Divine wrath and vengeance.
Related Commentaries of Psalms 78:51
Psalms 78:51
51 And smote all the firstborn in Egypt; the chief of their strength in the tabernacles of Ham: