Rubbing them in their hands - The word “corn” here means wheat or barley, and not maize, as in America. They rubbed it in their hands to separate the grain from the chaff. This was common and allowable. Dr. Thomson (“The Land and the Book,” vol. ii. p. 510, 511) says: “I have often seen my muleteers, as we passed along the wheat fields, pluck off ears, rub them in their hands, and eat the grains, unroasted, just as the apostles are said to have done. This also is allowable. The Pharisees did not object to the thing itself, only to the time when it was done. They said it was not lawful to do this on the Sabbath-day. It was work forbidden by those who, through their traditions, had made man for the Sabbath, not the Sabbath for man.” So Professor Hackett (“Illustrations of Scripture,” p. 176, 177) says: “The incident of plucking the ears of wheat, rubbing out the kernels in their hands, and eating them Luk_6:1, is one which the traveler sees often at present who is in Palestine at the time of the gathering of the harvest. Dr. Robinson relates the following case: ‘Our Arabs were an hungered, and, going into the fields, they plucked the ears of grain and did eat, rubbing them in their hands. On being questioned, they said this was an old custom, and no one would speak against it; they were supposed to be hungry, and it was allowed as a charity.’ The Pharisees complained of the disciples for violating the Sabbath, and not any rights of property.” - Albert Barnes