Jamieson, Fausset and Brown on Matthew 21:41

41. They say unto him, He will miserably destroy those wicked men--an emphatic alliteration not easily conveyed in English: "He will badly destroy those bad men," or "miserably destroy those miserable men," is something like it.

and will let out his vineyard unto other husbandmen, which shall render him the fruits in their seasons--If this answer was given by the Pharisees, to whom our Lord addressed the parable, they thus unwittingly pronounced their own condemnation: as did David to Nathan the prophet (2Sa 12:5-7), and Simon the Pharisee to our Lord (Lu 7:43, &c.). But if it was given, as the two other Evangelists agree in representing it, by our Lord Himself, and the explicitness of the answer would seem to favor that supposition, then we can better explain the exclamation of the Pharisees which followed it, in Luke's report (Lu 20:16)--"And when they heard it, they said, God forbid"--His whole meaning now bursting upon them.