Commentaries:
Barnes' Notes
No man at the table knew - This shows that Jesus had signified to John only who it was that should betray him.
The bag - The traveling-bag in which they put their common property. See the notes at John 12:6.
Have need of against the feast - The feast of the Passover. This feast continued seven days, and they supposed that Jesus had directed him to make preparation for their needs on those days.
Other Barnes' Notes entries containing John 13:28:
Matthew 26:21-24
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