Deuteronomy 4:9-10

9Only take heed to thyself, and keep thy soul diligently, lest thou forget the things which thine eyes saw, and lest they depart from thy heart all the days of thy life; but make them known unto thy children and thy children’s children; 10the day that thou stoodest before Jehovah thy God in Horeb, when Jehovah said unto me, Assemble me the people, and I will make them hear my words, that they may learn to fear me all the days that they live upon the earth, and that they may teach their children.