At the Aposticha, stichera from the Pentecostarion; and Glory…, in Tone III—

In sanctity let us praise Athanasius, the great adornment of hierarchs, the invincible intercessor; for, having mown down the hordes of heresies with the power of the all-holy Spirit, he raised up trophies to Orthodoxy throughout all the world, piously defining the mystery of the Trinity through the character of Its Persons, and uniting them into One, without confusion, through Their identical essence. And, theologizing like one of the cherubim, he ever prayeth for our souls.

Now & ever…: doxasticon from the Pentecostarion.