The Pharisees wanted Jesus to give them a sign from the sky. That is, a sign from heaven. They wanted Jesus to prove to them that God gave Jesus permission to do these miracles. They thought that Satan gave Jesus permission to do these things (see: 9:34; Mark 3:22)
In ancient Israel, the Pharisees and Sadducees predicted the weather. It is very difficult to know what will happen with the weather. Jesus said they were able to see certain things and know what the weather would do. However, they saw the things Jesus did, but could not understand the things that were happening around them.
When Jesus spoke about an “adulterous generation,” he used a metaphor. Some scholars think Jesus was speaking directly to the Scribes and Pharisees, and told them they were an “adulterous generation”. That is, the Scribes and Pharisees did not truly obey and follow God completely.
Jonah was a prophet in ancient Israel (see: Jonah 1-4). He was swallowed by a fish and was in the fish for three days. After three days, he was released. Something like this was going to happen to Jesus. He would die and after three days, he would come back to life.
The disciples did not understand what Jesus meant when he talked about the yeast. They thought he was concerned because they did not bring bread with them.
Jesus asked many different questions because they did not understand what Jesus was saying about who he is and why he did these things. They knew Jesus had already fed more than 5000 people through a miracle, but they forgot he could do this and worried that the people would not eat. Therefore, Jesus rebuked them. That is, he spoke to them in a way that they would know they did something wrong.
Many years before Jesus lived, Daniel prophesied about the “son of man” (see: Daniel 7:13). Jesus asked who people thought fulfilled this prophecy. People did not agree about who fulfilled Daniel’s prophecy. Jesus is the Son of man.
Some scholars think when Jesus spoke about the rock upon which he would build his church, he used a metaphor. They think he was speaking about what Peter said. That is, that Jesus is the Christ, the Son of the Living God. A “rock” is solid and a large rock cannot be changed. Jesus is the messiah and this can never be changed. Fewer scholars think Jesus was speaking about making his church with the things done by Peter and the apostles.
Jesus spoke about the gates of Hades. Hades is another name for hell. Some scholars think Jesus wanted to say that Satan is not able to stop Jesus from doing the things Jesus wanted to do. Other scholars think this was a metaphor. People who believe in Jesus will not live forever in hell after they die.
Jesus said that he will give Peter the keys to the kingdom of heaven. He gave Peter permission to do something. Scholars think Jesus gave Peter and the other apostles permission to teach people how to live in a way that honored God. They would help people understand Jesus and the Law of Moses.
Jesus gave Peter permission to bind and loose certain things on the earth. Some scholars think Jesus gave Peter, and the apostles, permission to rule over Christians. That is, they could allow Christians to do some things and they could make Christians stop doing other things. Some scholars think Peter will be able to do this when Jesus rules on the earth. Other scholars think God was going to teach people, through the apostles, how to live in a way that honored God after Jesus died. He would do this by revealing himself to the apostles and prophets.
When Matthew spoke about the elders, he was speaking about older men in Israel who lead the people in some way. Together these three groups helped to lead Israel to worship and obey God.
Peter rebuked Jesus, that is. Peter said that Jesus must not be speaking correctly. Peter thought that the messiah would not suffer and die in the way Jesus said. However, Jesus rebuked Peter. He said Peter did something wrong. The things he said were the things that Satan wanted Peter to say. He wanted the messiah to be the way he wanted the messiah to be, and not to do the things God wanted the messiah to do.
Jesus said that Peter was a stumbling block. This was a metaphor. Even though he did not know it, Peter was tempting Jesus. He was trying to get Jesus to do what Satan wanted, not what God wanted.
Jesus died on a cross. He obeyed God even though he suffered for obeying God. He wanted people to do the same thing. He wanted them to obey God, even if they suffered because they obeyed God.
Jesus talked about “life” in two ways in this passage. He spoke about the life a person has before they die and the life they have after they die. He wanted people to obey God before they die if they wanted to live with God in heaven forever. Those who die on Earth because they obeyed God will live with God in heaven after they die.
Jesus said that some of the people with him will not die before they see the Son of man coming in his kingdom. Some scholars think Jesus was speaking about revealing himself to the disciples after his resurrection. Other scholars think Matthew will write about this in Matthew 17.