Cyril of Alexandria
Catena Aurea · Lukasevangelium 6
And it came to pass also on another sabbath, that he entered into the synagogue and taught: and there was a man whose right hand was withered. And the Scribes and Pharisees watched him, whether he would heal on the sabbath day; that they might find an accusation against him. But he knew their thoughts, and said to the man which had the withered hand, Rise up, and stand forth in the midst. And he arose and stood forth. Then said Jesus unto them, I will ask you one thing; Is it lawful on the sabbath days to do good, or to do evil? to save life, or to destroy it? And looking round about upon them all, he said unto the man, Stretch forth thy hand. And he did so: and his hand was restored whole as the other. And they were filled with madness; and communed one with another what they might do to Jesus.
This is a very useful question, for if it is lawful to do good on the sabbath, and there is no reason why those who work should not obtain mercy from God, cease to gather up accusation against Christ. But if it be not lawful to do good on the sabbath, and the law prohibits the safety of life, thou art become the accuser of the law. For if we examine the very institution of the sabbath, we shall find it was introduced for an object of mercy, for God commanded to keep holy the sabbath, that may rest thy man servant and thy maid servant, and all thy cattle. (Exod. 20:23.) But he who has mercy on his ox, and the rest of his cattle, how much rather will he not have mercy on man troubled with a severe disease?