Or what man is there of you, whom if his son ask bread, will he give him a stone?

People's New Testament

7:9,10 If his son shall ask bread, will he give him a stone? The assurance of an answer to prayer is based on the fact that God is our Father. He treats his children as a good and wise earthly parent would. No kind parent would mock his child by answering his cry for bread with stones. Bread and fish were the chief articles of food of the Galilean peasant.

Jamieson-Fausset-Brown Bible Commentary

9. Or what man is there of you, whom if his son ask bread-a loaf.

will he give him a stone?-round and smooth like such a loaf or cake as was much in use, but only to mock him.

Matthew Henry's Concise Commentary

7:7-11 Prayer is the appointed means for obtaining what we need. Pray; pray often; make a business of prayer, and be serious and earnest in it. Ask, as a beggar asks alms. Ask, as a traveller asks the way. Seek, as for a thing of value that we have lost; or as the merchantman that seeks goodly pearls. Knock, as he that desires to enter into the house knocks at the door. Sin has shut and barred the door against us; by prayer we knock. Whatever you pray for, according to the promise, shall be given you, if God see it fit for you, and what would you have more? This is made to apply to all that pray aright; every one that asketh receiveth, whether Jew or Gentile, young or old, rich or poor, high or low, master or servant, learned or unlearned, all are alike welcome to the throne of grace, if they come in faith. It is explained by a comparison taken from earthly parents, and their readiness to give their children what they ask. Parents are often foolishly fond, but God is all-wise; he knows what we need, what we desire, and what is fit for us. Let us never suppose our heavenly Father would bid us pray, and then refuse to hear, or give us what would be hurtful.