They sent some of the Pharisees and supporters of Herod to trap him in his words.
References for Mark 12:13
They came to him and said, "Teacher, we know that you're genuine and you don't worry about what people think. You don't show favoritism but teach God's way as it really is. Does the Law allow people to pay taxes to Caesar or not? Should we pay taxes or not?"
Since Jesus recognized their deceit, he said to them, "Why are you testing me? Bring me a coin. Show it to me."
And they brought one. He said to them, "Whose image and inscription is this?"
"Caesar's," they replied.Jesus said to them, "Give to Caesar what belongs to Caesar and to God what belongs to God." His reply left them overcome with wonder.