Exodus 11:5-7

Contemporary English Version

⁵ and wherever he goes, the first-born son in every family will die. Your own son will die, and so will the son of the lowest slave woman. Even the first-born males of your cattle will die. ⁶ Everywhere in Egypt there will be loud crying. Nothing like this has ever happened before or will ever happen again.

⁷ But there won't be any need for the Israelites to cry. Things will be so quiet that not even a dog will be heard barking. Then you Egyptians will know that the Lord is good to the Israelites, even while he punishes you.