On a Sabbath, while he was going through the grainfields, his disciples plucked and ate some heads of grain, rubbing them in their hands. But some of the Pharisees said, “Why are you doing what is not lawful to do on the Sabbath?” And Jesus answered them, “Have you not read what David did when he was hungry, he and those who were with him: how he entered the house of God and took and ate the bread of the Presence, which is not lawful for any but the priests to eat, and also gave it to those with him?” And he said to them, “The Son of Man is lord of the Sabbath.” Luke 6:1-5.
God did not give His laws to make life hard or to make people suffer. It was to give their lives order instead of chaos. That order included setting aside a day to acknowledge God in a way that made Him preeminent, and it was to give us rest. It was not a day to be extra nervous about screwing up. “For this is the love of God, that we keep his commandments. And his commandments are not burdensome.” (1 John 5:3).
The people who usually brought petty charges against Jesus were those who really knew the text of the scriptures, but didn’t seem to know the reasons behind them. We must guard against this by not only learning the scriptures, but getting to know the author.