Psalms 78:51

51. Smote all the firstborn The last and effectual plague. The greatness of the judgment, and its singular feature in falling only upon the “firstborn,” marked it as a direct visitation of God. It struck down the chief of their strength, and another step might have extinguished the nation. The firstborn of beast included their sacred animals; the goat, ram, calf, sacred bull, crocodile, all were smitten, and their gods and worship brought into contempt.

Tabernacles of Ham A poetical designation of Egypt, called Ham, (or the dark skinned race,) after its ancestor, (Genesis 10:6,) but otherwise in Hebrew always Mizraim, after the son of Ham, who settled the country. The ancients often designated nations according to their colour, the Hebrews after their ancestry. See on Psalms 105:23