'Loaf' in the Bible

Or what man is there of you, who, if his son shall ask him for a loaf, will give him a stone;

And they forgot to take bread; and they had not in the boat with them more than one loaf.

And of which of you that is a father shall his son ask a loaf, and he give him a stone? or a fish, and he for a fish give him a serpent?