John Trapp on Matthew 22:36

Verse 36. Which is the great Commandment] The Rabbins reckoned up 613. Commandments of the Law: and distinguished them into the greater, and the lesser. These later they thought might be neglected or violated with little or no guilt. The Romish Pharisees have also their veniall sins, their peccadillo's, as we know; but the Scripture makes all sin mortall and destructory. A little strange fire might seem a small matter, yet it was such a sin, as made all Israel guilty, as appears by the sacrifices offered for that sin. Levit. 16.