Gregory the Great
Catena Aurea · Matthäusevangelium 11
And as they departed, Jesus began to say unto the multitudes concerning John, What went ye out into the wilderness to see? A reed shaken with the wind? But what went ye out for to see? A man clothed in soft raiment? behold, they that wear soft clothing are in kings’ houses. But what went ye out for to see? A prophet? yea, I say unto you, and more than a prophet. For this is he, of whom it is written, Behold, I send my messenger before thy face, which shall prepare thy way before thee.
(ubi. sup.) Also John was not clothed in soft raiment, that is, he did not encourage sinners in their sinful life by speaking smooth things, but rebuked them with sharpness and rigour, saying, Generation of vipers, &c. (Mat. 3:7)