Mark 8:4
"And his disciples answered him, From whence can a man satisfy these men with bread here in the wilderness?"
Cross References (ranked by relevance)
Mark 6:52
For they considered not the miracle of the loaves: for their heart was hardened.
Matthew 15:33
And his disciples say unto him, Whence should we have so much bread in the wilderness, as to fill so great a multitude?
2 Kings 7:2
Then a lord on whose hand the king leaned answered the man of God, and said, Behold, if the LORD would make windows in heaven, might this thing be? And he said, Behold, thou shalt see it with thine eyes, but shalt not eat thereof.