Then saith he to the man, Stretch forth thine hand. And he stretched it forth; and it was restored whole, like as the other. Stretch forth thine hand - The bare command of God is a sufficient reason of obedience. This man might have reasoned thus: "Lord, my hand is withered; how then can I stretch it out? Make it whole first, and afterwards I will do as thou commandest." This may appear reasonable, but in his case it would have been foolishness. At the command of the Lord he made the effort, and in making it the cure was effected! Faith disregards apparent impossibilities, where there is a command and promise of God. The effort to believe is, often, that faith by which the soul is healed.
A little before (Matthew 12:6, Matthew 12:8) Jesus Christ had asserted his Godhead, in this verse he proves it. What but the omnipotence of the living God could have, in a moment, restored this withered hand? There could be no collusion here; the man who had a real disease was instantaneously and therefore miraculously cured; and the mercy and power of God were both amply manifested in this business.
It is worthy of remark, that as the man was healed with a word, without even a touch, the Sabbath was unbroken, even according to their most rigid interpretation of the letter of the law.