And they send unto him certain of the Pharisees and of the Herodians, to catch him in his words. And they send unto him - See this, and to Mark 12:17, largely explained on Matthew 22:15-22 (note).
Related Commentaries of Mark 12:13
Mark 12:13
13 And they send unto him certain of the Pharisees and of the Herodians, to catch him in his words.