Exodus 10:2

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.

And that thou mayest tell ... There was a further and higher reason for the infliction of those awful judgments-namely, that the knowledge of them then, and the permanent record of them in the sacred history, might furnish a salutary and impressive lesson to the Church down to the latest ages, (cf. Psalms 78:1-72; Psalms 105:1-45.) Worldly historians might have described them as extraordinary occurrences that marked this era of Moses in ancient Egypt. But we are taught to trace them to their cause-the judgments of divine wrath on a grossly idolatrous king and nation.