'On the Sabbath' in the Bible

And they entered into Capernaum, and straightway on the Sabbath days he entered into the synagogue and taught.

And it chanced that he went through the corn fields on the Sabbath day; and his disciples, as they went on their way, began to pluck the ears of corn.

And the Pharisees said unto him, "Behold, why do they on the Sabbath day that which is not lawful?"

and they watched him, to see whether he would heal him on the Sabbath day, that they might accuse him.

And he said to them, "Whether is it lawful? To do a good deed on the Sabbath day, or an evil? To save a man's life, or to kill?" But they held their peace.