Jesus therefore said to them, "Most assuredly, I tell you, it wasn't Moses who gave you the bread out of heaven, but my Father gives you the true bread out of heaven.

 Here the argument becomes specifically Jewish in its expression and assumptions and allusions. Jesus had just made a great claim. The true work of God was to believe in him. "Very well," said the Jews, "this is in effect a claim to be the Messiah. Prove it." 