'On the Sabbath' in the Bible

"Look," said the Pharisees to him, "Why are they doing on the Sabbath Day what is against the law?"

And they kept watching Jesus to see whether he would cure him on the Sabbath; so as to have some charge to bring against him.

Then he asked them. "Is it lawful to do good on the Sabbath Day, or to do harm? to save a life, or to destroy it?"