Augustine of Hippo — as excerpted in the Catena Aurea on Luke 9:10-17

“(de Con. Ev. 1. 2. c. 45.) Matthew and Mark, taking occasion from what had occurred above, relate here how John was slain by Herod. But Luke, who had long before given an account of John’s sufferings, after mentioning that perplexity of Herod’s, as to who our Lord was, immediately adds, And the apostles when they were returned told him all that they had done.”