Deuteronomy 4:9-10

9But be very careful! Never forget the things that you yourselves have seen. Remember these things for as long as you live. Tell your children and your grandchildren about all the things that God has done.

10Remember when you stood in front of the Lord your God at Sinai. He said to me, ‘Bring all the people here to me so that I can tell them my commands. Then they will learn to respect me and obey me. They will do this for as long as they live and they will teach my commands to their children.’