O God, who on the holy mount revealed to chosen witnesses your well-beloved Son, wonderfully transfigured, in raiment white and glistening: Mercifully grant that we, being delivered from the disquietude of this world, may by faith behold the King in his beauty; who with you, O Father, and you, O Holy Spirit, lives and reigns, one God, for ever and ever. Amen. (From the BCP 1970, pg. 243)
Learn more about the Feast of the Transfiguration.