'On the Sabbath' in the Bible

And they went into Capernaum; and immediately on the sabbath he entered into the synagogue and taught.

And it came to pass, that he went through the corn-fields on the sabbath; and his disciples began, as they went, to pluck the ears of corn.

And the Pharisees said to him, Behold, why do they on the sabbath that which is not lawful?

And they watched him, to see 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 held their peace.