Mark 8:27–38
When Jesus spoke to his disciples about His coming suffering and death, Peter rebuked Jesus. Clashing with Peter’s scold, Jesus then rebuked Peter of his human concerns instead of Godly ones. Calling a crowd, Jesus explained the weight of being a disciple- losing your own life for the sake of the Gospel and denying yourself on earth to someday gain eternal life.

27And Jesus went on with his disciples to the villages of Caesarea Philippi. And on the way he asked his disciples, “Who do people say that I am?” 28And they told him, “John the Baptist; and others say, Elijah; and others, one of the prophets.” 29And he asked them, “But who do you say that I am?” Peter answered him, “You are the Christ.” 30And he strictly charged them to tell no one about him.
31And he began to teach them that the Son of Man must suffer many things and be rejected by the elders and the chief priests and the scribes and be killed, and after three days rise again. 32And he said this plainly. And Peter took him aside and began to rebuke him. 33But turning and seeing his disciples, he rebuked Peter and said, “Get behind me, Satan! For you are not setting your mind on the things of God, but on the things of man.”
34And he called to him the crowd with his disciples and said to them, “If anyone would come after me, let him deny himself and take up his cross and follow me. 35For whoever would save his life will lose it, but whoever loses his life for my sake and the gospel’s will save it. 36For what does it profit a man to gain the whole world and forfeit his life? 37For what can a man give in return for his life? 38For whoever is ashamed of me and of my words in this adulterous and sinful generation, of him will the Son of Man also be ashamed when he comes in the glory of his Father with the holy angels.”