Albert Barnes Commentary John 15:20

"Remember the word that I said unto you, A servant is not greater than his lord. If they persecuted me, they will also persecute you; if they kept my word, they will keep yours also." — John 15:20 (ASV)

Remember the word that I said, and so on. At their first appointment to the apostolic office. See Matthew 10:24, 25.

If they have kept (Ezekiel 3:7).