Matthew 15:1
Did Jesus actually break the OT law?
Some accuse Jesus of ignoring his own guilt in lawbreaking with a "you do it too" excuse. But Jesus is not breaking the OT law; he is violating a "tradition of the elders" - part of the Pharisaic oral law, or code of interpretation, not the actual law. Jesus' own reply is a typical rabbinic response which points out that his accusers are guilty of a greater offense, which is a violation of the clear law (to honor one's parents) for the sake of a lesser interpretation of the law (Corban).
Attempts to interpret the law after this fashion resulted in peculiarities: For example, one could borrow something as long as they did not ask to borrow it (for that would constitute a transaction, and hence work); one could put out a lamp to save one's life, but not merely to turn it off to save oil; a man could not put vinegar on his tooth for a toothache, but he could put vinegar on his food -- and if he happened to get relief from that, it was OK.