Deuteronomy 11:2-9

And know ye this day: for I speak not with your children which have not known, and which have not seen the chastisement of the LORD your God, his greatness, his mighty hand, and his stretched out arm,

I speak not with your children which have not known ... but your eyes have seen. Moses is here giving a brief summary of the marvels and miracles of awful judgment which God had performed in effecting their release from the tyranny of Pharaoh, as well as those which had taken place in the wilderness; and he knew that he might dwell upon these, because he was addressing many who had been witnesses of these appalling incidents. For it will be remembered that the divine threatening, that they should die in the wilderness, and its execution, extended only to males from 20 years and upward, who were able to go forth to war. No males under 20 years of age, no females, and none of the tribe of Levi, were objects of the denunciation (see Numbers 14:28; Numbers 16:49). There might, therefore, have been many thousands of the Israelites at that time of whom Moses could say, "your eyes have seen all the great acts which He did;" and with regard to those, the historic review of Moses was well calculated to stir up their minds to the duty and advantages of obedience.