'Sabbath Day' in the Bible

and, behold a man was there who had a withered hand. And they asked him, saying, Is it lawful to heal on sabbath days? that they might accuse him.

Of how much more value then is a man than a sheep? Wherefore it is lawful to do good on the sabbath days.

And he saith to them, Is it lawful on the sabbath day to do good, or to do evil, to preserve life, or to kill? but they were silent.