This is the next part of the story. We do not know where this take places, though it is possible they are in the temple courtyard. Jesus is talking with some Sadducees.
This phrase identifies the Sadducees as being the group of Jews that say that no one would rise from the dead. It does not imply that some Sadducees believed that there is a resurrection and some did not. (See: [[rc://en/ta/man/translate/figs-distinguish]])
# if a man's brother dies, having a wife, and being childless
The Jews considered the children born from this kind of second marriage to belong to the dead man. They inherited his property and possessions and carried on his name. (See: [[rc://en/ta/man/translate/figs-explicit]])