Charles Ellicott Commentary John 7:21

"Jesus answered and said unto them, I did one work, and ye all marvel because thereof." — John 7:21 (ASV)

I have done one work—that is, the one conspicuous work of healing the infirm man on the Sabbath day, which He did at His last visit to Jerusalem. We have already had a reference to other works in John 2:23, and He Himself refers to His many good works in John 10:32.

You all marvel.—This answer is addressed to the multitude who said, Thou hast a devil, when He spoke of the intention to kill Him. This work on the Sabbath day, which provoked the deadly hostility of the hierarchy (John 5:16; John 5:18), was cause of wonder to them all. They, too, though not in the same degree, were led by it to take a hostile position.