The Pharisees use a laughable example to try and trap Jesus into pitting Himself against one of the two sides of the argument taking place: without belief in the afterlife or resurrection of the body, how are we bound by the laws and rules of this world in Christ’s resurrected life?
Jesus brushes aside the Pharisees’ simplistic logic by asserting that while marriage is the way of “this age” those found worthy of the resurrection will not be defined or bound by such labels, covenants or contracts. That heavenly life will transcend our categories; there death will be no more and we will be simply “children of God” enjoying an angelic existence.