This feast became widespread in the West in the 11th century and was introduced into the Roman calendar in 1457 to commemorate the victory over Islam in Belgrade. Before that, the Transfiguration of the Lord was celebrated in the Syrian, Byzantine, and Coptic rites. The Transfiguration foretells the glory of the Lord as God, and His ascension into heaven. It is an anticipation of the glory in heaven, where we shall see God face to face. We already share in this life, through grace, in the divine promise of eternal life.
In splendénti nube Spíritus Sanctus visus est, patérna vox audíta est: Hic est Fílius meus diléctus, in quo mihi bene complácui: ipsum audíte.
In a resplendent cloud the Holy Spirit appeared. The Father’s voice was heard: This is my beloved Son, with whom I am well pleased. Listen to him.
The Gloria in excelsis (Glory to God in the highest) is said.
O God, who in the glorious Transfiguration of your Only Begotten Son confirmed the mysteries of faith by the witness of the Fathers and wonderfully prefigured our full adoption to sonship, grant, we pray, to your servants” that, listening to the voice of your beloved Son, we may merit to become co-heirs with him. Who lives and reigns with you.
Dn 7:9–10, 13–14
As I watched: Thrones were set up and the Ancient One took his throne. His clothing was bright as snow, and the hair on his head as white as wool; his throne was flames of fire, with wheels of burning fire. A surging stream of fire flowed out from where he sat; thousands upon thousands were ministering to him, and myriads upon myriads attended him. The court was convened and the books were opened.
As the visions during the night continued, I saw: One like a Son of man coming, on the clouds of heaven; when he reached the Ancient One and was presented before him, the one like a Son of man received dominion, glory, and kingship; all peoples, nations, and languages serve him. His dominion is an everlasting dominion that shall not be taken away, his kingship shall not be destroyed.
R. The Lord is king, the Most High over all the earth.
Dóminus regnávit, Altíssimus super omnem terram.
The Lord is king; let the earth rejoice;
let the many islands be glad.
Clouds and darkness are round about him,
justice and judgment are the foundation of his throne.
The mountains melt like wax before the Lord,
before the Lord of all the earth.
The heavens proclaim his justice,
and all peoples see his glory.
Because you, O Lord, are the Most High over all the earth,
exalted far above all gods.
2 Pt 1:16–19
Beloved: We did not follow cleverly devised myths when we made known to you the power and coming of our Lord Jesus Christ, but we had been eyewitnesses of his majesty. For he received honor and glory from God the Father when that unique declaration came to him from the majestic glory, “This is my Son, my beloved, with whom I am well pleased.” We ourselves heard this voice come from heaven while we were with him on the holy mountain. Moreover, we possess the prophetic message that is altogether reliable. You will do well to be attentive to it, as to a lamp shining in a dark place, until day dawns and the morning star rises in your hearts.
Hic est Fílius meus diléctus, in quo mihi bene complácui: ipsum audíte.
This is my Son, my beloved, in whom is all my delight: listen to him.
Jesus took Peter, James, and his brother, John, and led them up a high mountain by themselves. And he was transfigured before them; his face shone like the sun and his clothes became white as light. And behold, Moses and Elijah appeared to them, conversing with him. Then Peter said to Jesus in reply, “Lord, it is good that we are here. If you wish, I will make three tents here, one for you, one for Moses, and one for Elijah.” While he was still speaking, behold, a bright cloud cast a shadow over them, then from the cloud came a voice that said, “This is my beloved Son, with whom I am well pleased; listen to him.” When the disciples heard this, they fell prostrate and were very much afraid. But Jesus came and touched them, saying, “Rise, and do not be afraid.” And when the disciples raised their eyes, they saw no one else but Jesus alone.
As they were coming down from the mountain, Jesus charged them, “Do not tell the vision to anyone until the Son of Man has been raised from the dead.”
Jesus took Peter, James, and his brother John, and led them up a high mountain apart by themselves. And he was transfigured before them, and his clothes became dazzling white, such as no fuller on earth could bleach them. Then Elijah appeared to them along with Moses, and they were conversing with Jesus. Then Peter said to Jesus in reply, “Rabbi, it is good that we are here! Let us make three tents: one for you, one for Moses, and one for Elijah.” He hardly knew what to say, they were so terrified. Then a cloud came, casting a shadow over them; from the cloud came a voice, “This is my beloved Son. Listen to him.” Suddenly, looking around, they no longer saw anyone but Jesus alone with them.
As they were coming down from the mountain, he charged them not to relate what they had seen to anyone, except when the Son of Man had risen from the dead. So they kept the matter to themselves, questioning what rising from the dead meant.
Jesus took Peter, John, and James and went up the mountain to pray. While he was praying his face changed in appearance and his clothing became dazzling white. And behold, two men were conversing with him, Moses and Elijah, who appeared in glory and spoke of his exodus that he was going to accomplish in Jerusalem. Peter and his companions had been overcome by sleep, but becoming fully awake, they saw his glory and the two men standing with him. As they were about to part from him, Peter said to Jesus, “Master, it is good that we are here; let us make three tents, one for you, one for Moses, and one for Elijah.” But he did not know what he was saying. While he was still speaking, a cloud came and cast a shadow over them, and they became frightened when they entered the cloud. Then from the cloud came a voice that said, “This is my chosen Son; listen to him.” After the voice had spoken, Jesus was found alone. They fell silent and did not at that time tell anyone what they had seen.