'Sabbath day' in the Bible

Then Jesus came to Nazareth, where he had been raised. As was his custom, he went into the synagogue on the Sabbath day. When he stood up to read,

But the synagogue leader, indignant because Jesus had healed on the Sabbath, told the crowd, "There are six days when work is to be done. So come on those days to be healed, and not on the Sabbath day."

Shouldn't this woman, a descendant of Abraham whom Satan has kept bound for eighteen long years, be set free from this bondage on the Sabbath day?"

Then he asked them, "If your son or ox falls into a well on the Sabbath day, you would pull him out immediately, wouldn't you?"