Deuteronomy 4:9-10

9Only take heed to yourself, and diligently keep yourself, lest you forget the things your eyes have seen, and lest they depart from your heart all the days of your life. And teach them to your children and your grandchildren,

10especially concerning the day you stood before the Lord your God in Horeb, when the Lord said to me, ‘Gather the people to Me, and I will let them hear My words, that they may learn to fear Me all the days they live on the earth, and that they may teach their children.’