John Chrysostom — as excerpted in the Catena Aurea on John 6:22-27

“(Hom. xliii. 2) Our Lord, though He did not actually shew Himself to the multitude walking on the sea, yet gave them the opportunity of inferring what had taken place; The day following, the people which stood on the other side of the sea saw that there was none other boat there, save that one whereinto His disciples were entered, and that Jesus went not with His disciples into the boat, but that His disciples were gone away alone. What was this but to suspect that He had walked across the sea, on His going away? For He could not have gone over in a ship, as there was only one there, that in which His disciples had entered; and He had not gone in with them.”