Mark 3:4

A difficulty here arises, how to reconcile St. Mark with St. Matthew. St. Mark puts the words into the mouth of Jesus Christ: Is it lawful? When St. Matthew says, that they interrogated him: Is it lawful? To cut the knot of this apparent difficulty, we must understand that they first put the question to our Lord, whether it was lawful to heal on the sabbath-day or not: and that Jesus understanding their thoughts, that they wished to have some grounds of accusation against him, placed the sick man in the midst of them, and said what St. Mark here relates of him: Is it lawful to do good on the sabbath-day, or to do evil? (St. Augustine)