After Stephen said that he could see Jesus standing beside God in heaven, they stoned him.

Acts 7:55-59

55 But the Holy Spirit completely controlled Stephen. He looked up into heaven and saw a dazzling light from God, and he saw Jesus standing at God’s right side. 56 “Look,” he said, “I see heaven open, and I see the one who came from heaven standing at God’s right side!”

57 When the Jewish Council members and others heard that, they shouted loudly. They put their hands over their ears so that they could not hear Stephen, and immediately they all rushed at him. 58 They dragged him outside the city of Jerusalem and started to throw stones at him. The people who were accusing him took off their outer garments in order to throw stones more easily, and they put their clothes on the ground next to a young man whose name was Saul, so that he could guard them. 59 While they continued to throw stones at Stephen, Stephen prayed, “Lord Jesus, receive my spirit!”