Complete Commentary on the Whole Bible, by Matthew Henry, at sacred-texts.com
(Num 12:1-9) God rebukes the murmuring of Aaron and Miriam.
(Num 12:10-16) Miriam struck with leprosy, and healed at the prayer of Moses.
The patience of Moses was tried in his own family, as well as by the people. The pretence was, that he had married a foreign wife; but probably their pride was hurt, and their envy stirred up, by his superior authority. Opposition from our near relations, and from religious friends, is most painful. But this is to be looked for, and it will be well if in such circumstances we can preserve the gentleness and meekness of Moses. Moses was thus fitted to the work he was called to. God not only cleared Moses, but praised him. Moses had the spirit of prophecy in a way which set him far above all other prophets; yet he that is least in the kingdom of heaven, is greater than he; and our Lord Jesus infinitely excels him, Heb 3:1. Let Miriam and Aaron consider whom it was they insulted. We have reason to be afraid of saying or doing any thing against the servants of God. And those are presumptuous indeed who are not afraid to speak evil of dignities, Pe2 2:10. The removal of God's presence is the surest and saddest token of God's displeasure. Woe to us, if he depart! he never departs, till by sin and folly we drive him from us.
The cloud departed, and Miriam became leprous. When God goes, evil comes: expect no good when God departs. Her foul tongue, as Bishop Hall says, was justly punished with a foul face. Aaron, as priest, was judge of the leprosy. He could not pronounce her leprous without trembling, knowing himself to be equally guilty. But if she was thus punished for speaking against Moses, what will become of those who sin against Christ? Aaron, who joined his sister in speaking against Moses, is forced for himself and his sister, to beseech him, and to speak highly of him whom he had so lately blamed. Those who trample upon the saints and servants of God, will one day be glad to make court to them. It is well when rebukes produce confession of sin and repentance. Such offenders, though corrected and disgraced, shall be pardoned. Moses made it appear, that he forgave the injury done him. To this pattern of Moses, and that of our Saviour, who said, "Father, forgive them," we must conform. A reason is given for Miriam's being put out of the camp for seven days; because thus she ought to accept the punishment of her sin. When under the tokens of God's displeasure for sin, it becomes us to take shame to ourselves. This hindered the people's progress in their march forward towards Canaan. Many things oppose us, but nothing so hinders us in the way to heaven, as sin.