John Gill Commentary Matthew 7:10

"or if he shall ask for a fish, will give him a serpent?" — Matthew 7:10 (ASV)

Or if he ask a fish, will he give him a serpent ?
] Which is somewhat like a fish, especially an eel. Fish and bread are mentioned, because these were common food; see (Mark 6:41) (Mark 8:6Mark 8:7) (John 21:13) and particularly in Galilee, a fish country, where Christ now was, and from where he had called his disciples, who were fishermen. In (Luke 11:12) it is added, "or if he shall ask an egg, will he offer him a scorpion?" which is used, as the rest, to show the absurdity and inhumanity of such conduct; and that indeed nothing of this kind is to be found among men, unless it be among monsters in nature.