'On the Sabbath' in the Bible

And they enter Capernaum; and immediately on the sabbath he was teaching in the synagogue.

And it came to pass, that he was going through the grainfields on the sabbath, and his disciples began, as they went along, to pluck the ears of grain.

And the Pharisees said to him, See, why are they doing on the sabbath that which is not lawful?

and they watched him, whether he would heal him on the sabbath, that they might accuse him.

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