Having stretched out his hand, he touched Under the Law, the touch of a leper was infectious; but as Christ possesses such purity as to repel all filth and defilement, he does not, by touching, either pollute himself with leprosy, or become a transgressor of the law. When he took upon him our flesh, he did not only deign to touch as with his hand, but was united to one and the same body with ourselves, that we might be flesh of his flesh, (Genesis 2:23.) Nor did he only stretch out his arm to us, but descended from heaven even to hell, and yet contracted no stain from it, but, retaining his innocence, took away all our impurities, and sprinkled us with his holiness. By his word alone he might have healed the leper; but he applied, at the same time, the touch of his hand, to express the feeling of compassion. Nor ought this to excite our wonder, since he chose to take upon him our flesh, that he might cleanse us from our sins. The stretching out of his hand was therefore an expression and token of infinite grace and goodness. What we indolently read, and coldly pass by, cannot be duly weighed without great astonishment. The Son of God was so far from disdaining to talk to a leper, that he even stretched out his hand to touch that uncleanness.

And Jesustouched him - It was an offence to the Jews to "touch" a leprous person, and was regarded as making him who did it ceremonially impure, Leviticus 13:3. The act of putting forth his hand and "touching" him, therefore, expressed the intention of Jesus to cure him, and was a pledge that he "was," in fact, already cured.

Jesus put forth his hand - I will; be thou clean - The most sovereign authority is assumed in this speech of our blessed Lord - I Will: there is here no supplication of any power superior to his own; and the event proved to the fullest conviction, and by the clearest demonstration, that his authority was absolute, and his power unlimited. Be thou cleansed, καθαρισθητι; a single word is enough.
And immediately his leprosy was cleansed - What an astonishing sight! A man whose whole body was covered over with the most loathsome disease, cleansed from it in a moment of time! Was it possible for any soul to resist the evidence of this fact? This action of Christ is a representation of that invisible hand which makes itself felt by the most insensible heart; of that internal word which makes itself heard by the most deaf; and of that supreme will which works every thing according to its own counsel.

And Jesus put forth his hand, and touched him,.... This is a wonderful instance both of the grace, and goodness of Christ, in touching this loathsome creature; and of his unspotted purity and holiness, which could not be defiled by it; and of his mighty power in healing by a touch, and with a word of his mouth,
saying, I will, be thou clean: in which he expresses at once his willingness, "I will", of which the leper before was not certain; and his power by a word of command, "be thou clean"; and in which also is shown the readiness of Christ to do it: he did not stand parleying with the man, or making any further trial of his faith, or objecting to him his uncleanness; but at once stretches out his hand, touches his filthy flesh, and commands off the disorder. A great encouragement this, for poor sensible sinners to betake themselves to Christ, under a sense of their guilt and filth; who readily receives such, in no wise casts them out, but gives immediate discoveries of his power and grace unto them:
And immediately his leprosy was cleansed, or he was cleansed from it; he was not only pronounced clean, but was made so; he was thoroughly healed of the disease of leprosy. The Jews, themselves acknowledge this fact; for so they tell us in their wicked and blasphemous book (e), that Jesus should say,
"bring me a leper, and I will heal him; and they brought him a leper, and he healed him also by Shemhamphorash,''
i.e. by the ineffable name Jehovah. Though they greatly misrepresent the matter; for this man was not brought by others, at the request of Christ, but came of his own accord; nor was he healed by the use of any name, as if it was done by a sort of magic, but by a touch of his hand, and the word of his mouth. Whether this was the same man with Simon the leper, Matthew 26:6 as some have thought, is not certain.
(e) Toldos Jesu, p. 8.

And Jesus--or "He," according to another reading,--"moved with compassion," says Mark (Mark 1:41); a precious addition.
put forth his hand, and touched him--Such a touch occasioned ceremonial defilement (Leviticus 5:3); even as the leper's coming near enough for contact was against the Levitical regulations (Leviticus 13:46). But as the man's faith told him there would be no case for such regulations if the cure he hoped to experience should be accomplished, so He who had healing in His wings transcended all such statutes.
saying, I will; be thou clean--How majestic those two words! By not assuring the man of His power to heal him, He delightfully sets His seal to the man's previous confession of that power; and by assuring him of the one thing of which he had any doubt, and for which he waited--His will to do it--He makes a claim as divine as the cure which immediately followed it.
And immediately his leprosy was cleansed--Mark, more emphatic, says (Mark 1:42), "And as soon as He had spoken, immediately the leprosy departed from him, and he was cleansed"--as perfectly as instantaneously. What a contrast this to modern pretended cures!

Touched him . . . straitway his leprosy was cleansed. To touch a leper was forbidden, and carried ceremonial defilement, but at the touch of Jesus the source of the defilement fled, and the leper was clean. At the touch of Jesus all impurity flees.