Set your hearts unto all the words. — Rashi compares Ezekiel 40:4 : “Son of man, behold with thine eyes, and hear with thine ears, and set thine heart upon all that I shew thee.”
Which ye shall command. — Rather, that ye may command your children to observe to do all the words of this law. Obviously the knowledge of the law would depend very much on personal instruction for some time to come.