'Sabbath day' in the Bible

Another time, as he was going through the corn-fields on the sabbath-day, his disciples as they pass'd along began to pluck the ears of corn.

upon which the Pharisees said to him, pray observe how they trespass on the sabbath-day.

the Pharisees watched Jesus, to see if he would heal him on the sabbath-day, that so they might accuse him.