Commentaries:
Robertson's Word Pictures (NT)
One work (en ergon). Direct allusion to the healing of the impotent man when in Jerusalem before (John 5:1 ff.). He had wrought others before (John 2:23; John 4:45), but this one on the Sabbath caused the rulers to try to kill Jesus (John 5:18). Some wondered then, others had murder in their hearts. This crowd here is ignorant.
Other Robertson's Word Pictures (NT) entries containing John 7:21:
John 5:20
John 7:1
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