Mark 2:24

that which is not lawful They did not accuse them of theft, for the Law allowed what they were doing (Deuteronomy 23:25). They accused them of profaning the Sabbath. The Law of course forbade reaping and threshing on that day, but the Rabbis tad decided that even to pluck corn was to be construed as reaping, and to rub it as threshing. They even forbad walking on grass as a species of threshing, and would not allow so much as a fruit to be plucked from a tree on that day. See Lightfoot, Hor. Heb. in Matthew 12:2.