2 Kings 22:13, Deut 6:4-9, Deut 8:3, Jn 6:49-51
In the Old Testament, King Josiah taught and instructed all the people of Israel to keep the book of the covenant that King Josiah found in the temple. (2 Kings 23:2-3)
2 Kings 23:2 And the king went up into the house of the Lord, and all the men of Judah and all the inhabitants of Jerusalem with him, and the priests, and the prophets, and all the people, both small and great: and he read in their ears all the words of the book of the covenant which was found in the house of the Lord. 3 And the king stood by a pillar, and made a covenant before the Lord, to walk after the Lord, and to keep his commandments and his testimonies and his statutes with all their heart and all their soul, to perform the words of this covenant that were written in this book. And all the people stood to the covenant.
The people of Israel received great wrath from God because they did not keep the words of God's Book of Covenant. (2 Kings 22:13)
2 Kings 22:13 Go ye, enquire of the Lord for me, and for the people, and for all Judah, concerning the words of this book that is found: for great is the wrath of the Lord that is kindled against us, because our fathers have not hearkened unto the words of this book, to do according unto all that which is written concerning us.
In the Old Testament, Moses taught and instructed the Israelites to keep the word of God. (Deut 6:4-9)
Deut 6:4 Hear, O Israel: The Lord our God is one Lord: 5 And thou shalt love the Lord thy God with all thine heart, and with all thy soul, and with all thy might. 6 And these words, which I command thee this day, shall be in thine heart: 7 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. 8 And thou shalt bind them for a sign upon thine hand, and they shall be as frontlets between thine eyes. 9 And thou shalt write them upon the posts of thy house, and on thy gates.
The Old Testament tells us that man must not live by bread alone, but by all the words of God. (Deut 8:3)
Deut 8:3 And he humbled thee, and suffered thee to hunger, and fed thee with manna, which thou knewest not, neither did thy fathers know; that he might make thee know that man doth not live by bread only, but by every word that proceedeth out of the mouth of the Lord doth man live.
Jesus is the word of God and the bread of life. (John 6:49-51)
John 6:49 Your fathers did eat manna in the wilderness, and are dead. 50 This is the bread which cometh down from heaven, that a man may eat thereof, and not die. 51 I am the living bread which came down from heaven: if any man eat of this bread, he shall live for ever: and the bread that I will give is my flesh, which I will give for the life of the world.