Mark 12:18

Then came unto him the Sadducees
The same day, immediately after he had silenced the Pharisees and Herodians: these were a set of men distinct from the former, in some of their sentiments, especially in their religions ones, and particularly in the following:

which say there is no resurrection:
of the dead, in a literal sense, either general or particular; (See Gill on Matthew 22:23);

and they asked him, saying;
as in the next verse.