The jews misapplied that commandment. They had become so concerned with appearances of the 'law' that they no longer used common sense- or submitted to the greatest law of love - and so they condemned the innocent.
Matthew 12:11 - 12 (NIV) 'He said to them, "If any of you has a sheep and it falls into a pit on the Sabbath, will you not take hold of it and lift it out? How much more valuable is a man than a sheep! Therefore it is lawful to do good on the Sabbath."
Luke 13:15 - "You hypocrites! Doesn't each of you on the Sabbath untie his ox or donkey from the stall and lead it out to give it water? Then should not this woman, a daughter of Abraham, whom Satan has kept bound for eighteen long years, be set free on the Sabbath day from what bound her?"
John 7:23-24 - "Now if a child can be circumcised on the Sabbath so that the law of Moses may not be broken, why are you angry with me for healing the whole man on the Sabbath? Stop judging by mere appearances, and make a right judgment."
Jesus never broke this command, and he did expect us to make a just decision - but we can only achieve understanding of these commands if we apply the greatest law of love, rather than mere rules of men.
Mark 2:27 - The Sabbath was made for man, not man for the Sabbath.
Best,
Tammy