Psalms 135:8

Who smote the firstborn of Egypt - As the last and the greatest of the plagues brought upon the Egyptians; the chief and crowning judgment under which they were made willing that the children of Israel should go, and which was in fact the judgment which secured their freedom. This is selected here evidently for this reason, instead of recounting all the plagues which were brought upon the Egyptians.

Both of man and beast - Exodus 11:5. Margin, as in Hebrew, From man unto beast. That is, including both; smiting both.