Matthew 22:24 The law said that when a woman's husband died without having a son, the man's brother had a responsibility to marry and care for the widow (Deut. 25:5-6). This law protected women who were left alone, because in that culture they usually had no other means to support themselves.
Matthew 22:29, 30 The Sadducees asked Jesus what marriage would be like in heaven. Jesus said it was more important to understand God's power than know what heaven will be like. In every generation and culture, ideas of eternal life tend to be based on images and experiences of present life. Jesus answered that these faulty ideas are caused by ignorance of God's Word. We must not make up our own ideas about eternity and heaven by thinking of it and God in human terms. We should concentrate more on our relationship with God than about what heaven will look like. Eventually we will find out, and it will be far beyond our greatest expectations.
Matthew 22:31, 32 Because the Sadducees accepted only the Pentateuch as God's Word, Jesus answered them from the book of Exodus (3:6). God would not have said, "I am the God of Abraham, the God of Isaac, and the God of Jacob" if God thought of Abraham, Isaac, and Jacob as dead. From God's perspective, they are alive. Jesus' use of the present tense pointed to the resurrection and the eternal life that all believers enjoy in Him.
Matthew 22:34 We might think the Pharisees would have been glad to see the Sadducees silenced. The question that the Sadducees had always used to trap them was finally answered by Jesus. But the Pharisees were too proud to be impressed. Jesus' answer gave them a theological victory over the Sadducees, but they were more interested in defeating Jesus than in learning the truth.