Jamieson, Fausset and Brown on John 7:21-24

21-24. I have done one work, &c.--Taking no notice of the popular appeal, as there were those there who knew well enough what He meant, He recalls His cure of the impotent man, and the murderous rage it had kindled (Joh 5:9, 16, 18). It may seem strange that He should refer to an event a year and a half old, as if but newly done. But their present attempt "to kill Him" brought up the past scene vividly, not only to Him, but without doubt to them, too, if indeed they had ever forgotten it; and by this fearless reference to it, exposing their hypocrisy and dark designs, He gave His position great moral strength.