This Sunday (June 24) is the feast of the Nativity of St. John the Baptist. This is such a major feast day in the Church that it traditionally has its own vigil - celebrated on June 23. The vigil's liturgy focuses on the annunciation of the birth of St. John of Baptist to his father, the priest Zechariah (or Zachary in some translations), and his corresponding response of unbelief. It provides an interesting parallel to the Annunciation of St. Gabriel to Our Lady, but where Zechariah responds with disbelief due to his wife's old age, Our Lady responds with faith.
Ant. Do not fear, Zechariah: thy prayer has been heard, and thy wife Elizabeth shall bear thee a son, and thou shalt call his name John; and he shall be great before the Lord; and he shall be filled with the Holy Spirit even from his mother's womb; and many shall rejoice in his birth.
V. O Lord, the king shall rejoice in thy strength; and he shall rejoice exceedingly in Thy salvation.
V. Glory be...
Ant. Thou hast crowned him with glory and honor, and hast set him over the works of Thy hands, O Lord.
Ant. His glory is great in Thy salvation; glory and great beauty shalt Thou lay upon him, O Lord.