Then said Jesus unto them,.... The Scribes and Pharisees, who were watching him, and whose thoughts, and the reasonings of their minds, purposes, and intentions, he full well knew: I will ask you one thing; or question, as they had asked him one before; Mat 12:10 is it lawful on the sabbath days to do good, or to do evil? to save life, or to destroy it? See Gill on Mar 3:4 to which may be added, that to save life on the sabbath day was agreeable to their own canons: there were many things which they allowed might be done on the sabbath day, when life was in danger, which otherwise were not lawful; See Gill on Mat 12:8.