Pseudo-Chrysostom
Catena Aurea · Matthäusevangelium 7
Or what man is there of you, whom if his son ask bread, will he give him a stone? Or if he ask a fish, will he give him a serpent? If ye then, being evil, know how to give good gifts unto your children, how much more shall your Father which is in heaven give good things to them that ask him?
And what are the things that we ought to ask, he shews under the likeness of a loaf, and a fish. The loaf is the word concerning the knowledge of God the Father. The stone is all falsehood that has a stumbling-block of offence to the soul.