Specially the day that thou stoodest before the Lord in Horeb,.... Above all things Moses would have them take care not to forget the day the law was given from Mount Sinai, which was so awful and solemn, when they saw the fire, the smoke, the lightning, and heard the thunder and the sound of the trumpet; all which were very shocking and terrifying: and though the men of this generation were but young then, being under twenty years of age, yet many of them were old enough to observe these things, and which one would think should never wear out of their minds: when the Lord said unto me, gather me the people together; not the elders of the people only, but the whole body of the people, as he did, and brought them to the foot of Mount Sinai, Exo 19:17, and I will make them hear my words; the ten commands which were spoken by the Lord himself aloud, with an articulate voice, in the hearing of all the people; and was such a terrible voice of words, that they that heard it entreated it might be spoken to them no more, Heb 12:19. that they may learn to fear me all the days that they shall live upon the earth; to reverence him the lawgiver, who is able to save and to destroy; to fear to offend him by breaking his laws, so holy, just, and good, and delivered in such an awful and solemn manner: and that they may teach their children; the words they had heard, teach them obedience to them, and to be careful not to act contrary to them; since that would bring down judgments upon them, and deprive them of the favour they enjoyed, of which they had seen instances.