Exodus 10:2

and that you may tell your children and grandchildren how severely I dealt with the Egyptians when I performed miraculous signs among them, so that all of you may know that I am the LORD.”

And that thou mayest tell in the ears of thy son, and of thy son’s son, what things I have wrought in Egypt, and my signs which I have done among them; that ye may know how that I am the LORD.