Solemnity of the Nativity of St. John the Baptist is June 24.
From the Feast of the Leavetaking of the Nativity of +John the Forerunner (June 25)
Apolytikion in the Fourth Tone
O Prophet and Forerunner of the presence of Christ, we who fervently honor you cannot worthily praise you. For by your revered and glorious birth the barrenness of your mother and the muteness of your father were unbound, and the incarnation of the Son of God is proclaimed to the world.
Kontakion in the Third Tone
She that once was barren doth today bring forth Christ’s Forerunner, John, the culmination and the crown of all the Prophets. For when he, in River Jordan, laid his hand on Him Whom the Prophets preached aforetime, he was revealed as God the Word’s fore-chosen Prophet, His mighty preacher, and His Forerunner in grace.