Irmos: Grant me a robe of light, O Thou Who coverest Thyself with light as with a garment, O most merciful Christ our God.
Kontakion, in Tone VIII: Spec. Mel.: “As first-fruits…”—
Through the knowledge of the Spirit thou didst foretell an abominable death for Valens, O wise one, and wast truly shown to be a glorious prophet.
Theotokion: O thou who alone gavest birth to the Word in the flesh at the archangel’s word, deliver our souls from the snares of the enemy, we pray.
With the winnowing-fan of the Faith thou didst gather the faithful in like wheat, O wise one, and by thy supplications thou didst burn up Valens like weeds in a bonfire.
Thou hast smoothed the tablets of the hearts of those who heed thee with faith, O divinely wise Isaacius, engraving the image of Orthodoxy upon them.
Burning with zeal in the Church of Christ as a faithful favorite of God, thou didst hold the reins of Valens, O venerable one, and didst speak to him in prophecy concerning the captivity of the Church and his abominable death. Wherefore, ever pray for us who honor thee, O venerable Isaacius.
Translated by Isaac Lambertsen. Edition menaion.en.lambertsen.