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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.
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[AD 60] Matthew on Deuteronomy 8:3
Then was Jesus led up of the Spirit into the wilderness to be tempted of the devil. And when he had fasted forty days and forty nights, he was afterward an hungred. And when the tempter came to him, he said, If thou be the Son of God, command that these stones be made bread. But he answered and said, It is written, Man shall not live by bread alone, but by every word that proceedeth out of the mouth of God. [Deuteronomy 8:3]
[AD 61] Luke on Deuteronomy 8:3
And Jesus being full of the Holy Ghost returned from Jordan, and was led by the Spirit into the wilderness, Being forty days tempted of the devil. And in those days he did eat nothing: and when they were ended, he afterward hungered. And the devil said unto him, If thou be the Son of God, command this stone that it be made bread. And Jesus answered him, saying, It is written, That man shall not live by bread alone, but by every word of God. [Deuteronomy 8:3]
[AD 215] Clement of Alexandria on Deuteronomy 8:3
One who possesses the Word, who is almighty God, needs nothing and never lacks any of the things he desires, for the Word is an infinite possession and the source of all our wealth. However, someone may object and insist that he has often seen the just in need of food. This is rare and happens only where no one else is just. Besides, let him read the beautiful sentence, “It is not by bread alone that the just man lives, but by the Word of the Lord,” who is the true bread, the bread of heaven. The good man is never really in want as long as he keeps intact his adherence to faith in God. For he can ask for and receive whatever he needs from the Father of all, and he can enjoy whatever belongs to him, if only he obey his Son. Then too, he has this advantage, that he can be free from feeling any want. The Word, who acts as our educator, gives us riches. There is no need to envy the wealth of others with those who have gained freedom from want through him. He who possesses this sort of wealth will inherit the kingdom of God.

Source: CHRIST THE EDUCATOR 3.7.39-40
[AD 1781] Richard Challoner on Deuteronomy 8:3
Not in bread alone: That is, that God is able to make food of what he pleases for the support of man.