Deuteronomy 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."
Cross References (ranked by relevance)
Matthew 4:4
70
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.
Luke 4:4
47
And Jesus answered him, saying, It is written, That man shall not live by bread alone, but by every word of God.
1 Corinthians 10:3
16
And did all eat the same spiritual meat;
Psalm 105:40
The people asked, and he brought quails, and satisfied them with the bread of heaven.
Psalm 37:3
Trust in the LORD, and do good; so shalt thou dwell in the land, and verily thou shalt be fed.