'On the Sabbath' in the Bible

He happened to be passing through the wheat fields on the Sabbath, and his disciples began to pick the heads of wheat as they made their way through.

And the Pharisees said to him, "Look! Why are they doing what it is against the law to do on the Sabbath?"

And they were watching him closely, to see whether he would cure him on the Sabbath, in order to get a charge to bring against him.

And he said to them, "Is it allowable to do people good on the Sabbath, or to do them harm? To save life or kill?" But they made no answer.