Thou art his disciple - This they cast at him as a reproach. His defense of Jesus they regarded as proof that he was his follower, and this they now attempted to show was inconsistent with being a friend of Moses and his law. Moses had given the law respecting the Sabbath; Jesus had healed a man contrary, in their view, to the law of Moses. They therefore held Jesus to be a violater and contemner of the law of Moses, and of course that his followers were also.
We are Moses’ disciples - We acknowledge the authority of the law of Moses, which they alleged Jesus has broken by healing on that day.