Deuteronomy 4:9-10

Only take care, and keep watch on your soul, for fear that the things which your eyes have seen go from your memory and from your heart all the days of your life; but let the knowledge of them be given to your children and to your children's children; That day when you were waiting before the Lord your God in Horeb, and the Lord said to me, Make all the people come together, so that hearing my words they may go in fear of me all the days of their life on earth and give this teaching to their children.