John Calvin Commentary Matthew 12:10

"and behold, a man having a withered hand. And they asked him, saying, Is it lawful to heal on the sabbath day? that they might accuse him." — Matthew 12:10 (ASV)

They asked him, saying. Mark and Luke say only that they watched what our Lord would do; but Matthew states more clearly that they also attacked him by words. It is probable that some others had been previously cured on Sabbath days; and for this reason, they asked if he believed it to be lawful for him to do again what he had formerly done.

They should have considered whether it was a work of God, or of man, to restore a withered hand by a mere touch or by a single word. When God appointed the Sabbath, he did not lay down a law for himself, or impose upon himself any restraint from performing operations on the Sabbath when he saw fit, just as on other days. It was excessive folly, therefore, to question this, and thus to prescribe rules for God himself, and to restrain the freedom of his operations.