AKATHIST Hymn to Our venerable and God-bearing Father St. John of Damascus

Troparion (Tone 8)

Champion of Orthodoxy, teacher of purity and of true worship,

the enlightener of the universe and the adornment of hierarchs:

all-wise father John, your teachings have gleamed with light upon all things.

Intercede before Christ God to save our souls.

Kontakion (Tone 4)

Let us sing praises to John, worthy of great honor,

the composer of hymns, the star and teacher of the Church, the defender of her doctrines:

through the might of the Lord¹s Cross he overcame heretical error

and as a fervent intercessor before God

he entreats that forgiveness of sins may be granted to all.

           

St. John of Damascus, has many nows him, is famous for his  "Three Apologetic Treatises against those Decrying the Holy Images", which he shows his Opposition against the Heresy of Iconoclasm and his 101 Chapter dealing the Ishmaelite Heresy, indeed the very first Christian polemical writing against Islam

St. John of Damascus, we pray for you to intercede for our Protection against Heretics and Saracens You can clink here  at St. John of Damascus Hagiography from Wikipedia about his life and writings as Church Father from the East.