And it came to pass about eight days after these sayings, he took Peter and John and James, and went up into a mountain to pray.
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Cyril of Alexandria
AD 444
“I say to you, there are some of those standing here who shall not taste of death until they have seen the kingdom of God.” … By the “kingdom of God” he means the sight of the glory in which he will appear at his revelation to the inhabitants of earth. He will come in the glory of God the Father and not in a humble condition like ours. How did he make those who received the promise spectators of a thing so wonderful? He goes up into the mountain taking three chosen disciples with him. He is transformed to such a surpassing and godlike brightness that his garments even glittered with rays of fire and seemed to flash like lightning. Besides, Moses and Elijah stood at Jesus’ side and spoke with one another about his departure that he was about, it says, to accomplish at Jerusalem. This meant the mystery of the dispensation in the flesh and of his precious suffering upon the cross. It is also true that the law of Moses and the word of the holy prophets foreshadowed the mystery of Christ. The law of Moses foreshadowed it by types and shadows, painting it as in a picture. The holy prophets in different ways declared beforehand that in due time he would appear in our likeness and for the salvation and life of us all, agree to suffer death on the tree. Moses and Elijah standing before him and talking with one another was a sort of representation. It excellently displayed our Lord Jesus Christ as having the law and the prophets for his bodyguard. It displayed Christ as being the Lord of the Law and the Prophets, as foretold in them by those things that they proclaimed in mutual agreement beforehand. The words of the prophets are not different from the teachings of the law. I imagine this was what the most priestly Moses and the most distinguished of the prophets Elijah were talking about with one another. Commentary on Luke, Homily