A.T. Robertson Commentary John 7:21

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

One work (εν εργον). Direct allusion to the healing of the impotent man when in Jerusalem before (5:1ff.). He had wrought others before (2:23; 4:45), but this one on the Sabbath caused the rulers to try to kill Jesus (5:18). Some wondered then, others had murder in their hearts. This crowd here is ignorant.