John Gill Commentary Matthew 7:9

"Or what man is there of you, who, if his son shall ask him for a loaf, will give him a stone;" — Matthew 7:9 (ASV)

Or what man is there of you

That is a father", as in (Luke 11:11) that is, is in the relation, and has the affections of a father; and indeed is a man, and has the nature and passions of a man; unless he is become a mere brute, and devoid of all humanity,

whom if his son ask bread, will he give him a stone ?

No, by no means; no man can act such a merciless, cruel part as this to a child: for though he might impose upon him by the likeness of some sort of stones with bread; yet could not hope to satisfy his hunger, or stop his mouth this way; but must expect to hear from him again with bitter complaints.