Troparion.
First Apostles and universal teachers, pray to the Lord of all to grant universal peace and great mercy to our souls.
Kontakion.
Firm and divine preachers, the top of Thy Apostles, O Lord, Thou didst accept Thy good things and peace: for Thou didst accept sickness and death more than all fruitfulness, the only knowledge of the heart.
You, Lord, accepted the most zealous preachers and filled with the gift of divine prophecy, Your supreme Apostles, into the heavenly villages of Your bliss, for eternal peace and pleasure; for You imputed all earthly suffering and their death to them above all merit, as one who leads all the thoughts of the heart.
A special feature of the holiday is the preparatory fast, which begins a week after Trinity Day. This fast is called Apostolic, and in common parlance Petrov or Petrovka. It is celebrated in remembrance of the fact that the Apostles fasted before going out to preach.