Deuteronomy 4:9-10

9Only take heed to thyself, and keep thy soul diligently, lest thou forget the things that thine eyes have seen (and lest they depart from thy heart all the days of thy life; but thou shalt make them known to thy sons and to thy sons' sons),

10the day that thou stoodest before Jehovah thy 1God in Horeb, when Jehovah said to me, Gather me the people together, that I may cause them to hear my words, that they may learn them, and fear me all the days that they live upon the earth, and teach them to their children.