'On the Sabbath' in the Bible

And they go into Capernaum; and straightway on the sabbath, going into the synagogue, He was teaching.

And it came to pass that He was going on the sabbath through the grainfields; and His disciples began to make a way, plucking the heads of grain.

And the Pharisees said to them, "Behold, why are they doing on the sabbath that which is not lawful?"

And they were watching Him, whether He would heal him on the sabbath; that they might accuse Him.

And He saith to them, "Is it lawful on the sabbath to do good, or to do harm, to save a life, or to kill?" But they were silent.