Deuteronomy 11:18

And it shall be for a sign unto thee upon thine hand, and for a memorial between thine eyes, that the LORD's law may be in thy mouth: for with a strong hand hath the LORD brought thee out of Egypt.

And these words, which I command thee this day, shall be in thine heart: And thou shalt teach them diligently unto thy children, and shalt talk of them when thou sittest in thine house, and when thou walkest by the way, and when thou liest down, and when thou risest up. And thou shalt bind them for a sign upon thine hand, and they shall be as frontlets between thine eyes. And thou shalt write them upon the posts of thy house, and on thy gates.

And he said unto them, Set your hearts unto all the words which I testify among you this day, which ye shall command your children to observe to do, all the words of this law.

Thy word have I hid in mine heart, that I might not sin against thee.

My son, forget not my law; but let thine heart keep my commandments:

My son, keep thy father's commandment, and forsake not the law of thy mother: Bind them continually upon thine heart, and tie them about thy neck. When thou goest, it shall lead thee; when thou sleepest, it shall keep thee; and when thou awakest, it shall talk with thee. For the commandment is a lamp; and the law is light; and reproofs of instruction are the way of life:

Keep my commandments, and live; and my law as the apple of thine eye.