Jerome — as excerpted in the Catena Aurea on Matthew 11:1-6

“Therefore he does not ask as being himself ignorant. But as the Saviour asks where Lazarus is buried (John 11:34.), in order that they who shewed. Him the sepulchre might be so far prepared for faith, and believe that the dead was verily raised again—so John, about to be put to death by Herod, sends his disciples to Christ, that by this opportunity of seeing His signs and wonders they might believe on Him, and so might learn through their master’s enquiry. But John’s disciples had somewhat of bitterness and jealousy towards the Lord, as their former enquiry shewed, Why do we and the Pharisees fast oft, but thy disciples fast not?”