 And Rabbah son of Rav Huna did not eat breakfast until he took his child (or some say grandchild) to school.A Baraita deduced from the proximity of the words "And you shall make them known to your children and your children's children" in to the words "The day on which you stood before the Lord your God in Horeb" in that just as at Mount Sinai, the Israelites stood in dread, fear, trembling, and quaking, so when one teaches Torah to one's child, one should do so in dread, fear, trembling, and quaking.The Rabbis related Jacob's dream in to Sinai.