'On the Sabbath' in the Bible

And they went into Capernaum, and immediately on the Sabbath he entered the synagogue and taught.

And the Pharisees said to him, "Look, why are they doing what is not lawful on the Sabbath?"

And they watched him closely, to see whether he would heal him on the Sabbath, so that they might accuse him.

Then he said to them, "Is it lawful on the Sabbath to do good or to do evil, to save life or to kill?" But they kept silent.