"The Hierarchs of Christ, and the pride of the Fathers..."

The Holy Three Hierarchs: Sts. Basil the Great, Gregory the Theologian and John Chrysostom (source)

  
The Hierarchs of Christ, and the pride of the Fathers, the towers of the Faith, and the Teachers and protectors of the Faithful, let us gather together, O lovers of feasts, and offer them hymns of praise, hymning them as we say: Rejoice, light of the Church, O wise Basil, and immovable pillar. Rejoice, heavenly nous, O great Archpriest, Gregory the Theologian. Rejoice, O all-golden John Chrysostom, the stentorian preacher of repentance. But, O thrice-joyous Fathers, do not cease to ever entreat Christ on behalf of those who celebrate your all-sacred and divine feast with faith and fervor.
-Doxastikon of the Litia in the Plagal of the Second Tone

(source)

Through the prayers of our Holy Fathers, Lord Jesus Christ our God, have mercy on us and save us! Amen!