TROPARION:

You were transfigured on the mountain, O Christ God, showing your Disciples as much of your glory as they could hold. Let your eternal light shine also upon us sinners, through the prayers of the Mother of God. O Giver of Light, glory to You. 

KONTAKION:

On the mountain You were transfigured, O Christ our God, and your Disciples saw as much of your glory as they could hold, so that when they should see You crucified, they would know that You suffered willingly, and would proclaim to the world that You are truly the Splendor of the Father.