Charles H. Spurgeon on Psalms 78:51

And smote all the firstborn in Egypt. No exceptions were made, the monarch bewailed his heir as did the menial at the mill. They smote the Lord's firstborn, even Israel, and he smites theirs. The chief of their strength in the tabernacles of Ham. Swinging his scythe over the field, death topped off the highest flowers. The tents of Ham knew each one its own peculiar sorrow, and were made to sympathise with the sorrows which had been ruthlessly inflicted upon the habitations of Israel. Thus curses come home to roost. Oppressors are repaid in their own coin, without the discount of a penny.