'Sabbath day' in the Bible

And they entered into Capernaum, and straightaway on the Sabbath day, having entered into the synagogue, he taught.

And it came to pass, that he was passing through the grain fields on the Sabbath day, and his disciples began to make a path while plucking the ears.

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

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

And he says to them, Is it permitted to do good on the Sabbath day or to do harm, to save life or to kill? But they were silent.