"which you shall command your children to keep and to do — all the words of the Torah": Moses said to them: I must acknowledge my indebtedness to you for fulfilling the Torah after me. You, too, must acknowledge indebtedness to your children for fulfilling the Torah after you. Once, Rabbeinu came from Ludkia, and R. Yossi b. R. Yehudah and R. Elazar b. Yehudah came and sat before him. He said to them: Come closer, I must acknowledge my indebtedness to you for fulfilling the Torah after me. You, too, must acknowledge your indebtedness to your children for fulfilling the Torah after you. Moses was (undeniably) great, but if others did not come after him, his Torah would be valueless — we, how much more so! Thus, "which you shall command, etc."