John Chrysostom
Why, then, did Christ withdraw? First, so that in His absence the testimony would be free from every suspicion. The man who had received the sense of health was certainly a trustworthy witness of the benefit.
Second, He withdrew so as not to kindle their anger still more. He knew that the mere sight of one who is hated greatly inflames those who hate.
Therefore, by withdrawing, He leaves the deed itself to work before them. It is no longer He Himself who says anything about Himself, but those whom He healed. Together with them, even the accusers themselves speak.
They also, for their part, bear witness to the miracle. They did not say, "Why do You command this to be done on the Sabbath?" but, "Why do You do this on the Sabbath?"
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They are not indignant over a transgression, but envy the healing of the paralytic. Yet if there was a human action here, it lay in what the paralytic did. On Christ's part there was only a word and a command.
Thus here Christ commands another to violate the Sabbath. In other cases He Himself does this, as when He anoints the eyes with clay made from spittle.
But He does this not by transgressing the law, but by acting above the law. Of this, however, later. He does not justify Himself in the same way every time He is accused of breaking the Sabbath. This must be carefully observed.