John 4:31-33; Matthew 4:4

31 In the meantime His disciples urged Him, saying, "Rabbi, eat." 32 But He said to them, "I have food to eat of which you do not know." 33 Therefore the disciples said to one another, "Has anyone brought Him anything to eat?"
4 But He answered and said, "It is written, 'Man shall not live by bread alone, but by every word that proceeds from the mouth of God.' "