In the Gospel of Luke, certain verses imply that John the Baptist was born six months earlier than Jesus. And since it has become tradition that Jesus was born on 25 December (Christmas), Midsummer day, being six months before was taken to be the feast day of St. John the Baptist.
He that was greater than all who are born of women, the Prophet who received God’s testimony that he surpassed all the Prophets, was born of the aged and barren Elizabeth (Luke 1: 7) and filled all his kinsmen, and those that lived round about, with gladness and wonder. But even more wondrous was that which followed on the eighth day when he was circumcised, that is, the day on which a male child receives his name. Those present called him Zacharias, the name of his father. But the mother said, “Not so, but he shall be called John.” Since the child’s father was unable to speak, he was asked, by means of a sign, to indicate the child’s name. He then asked for a tablet and wrote, “His name is John.” And immediately Zacharias’ mouth was opened, his tongue was loosed from its silence of nine months, and filled with the Holy Spirit, he blessed the God of Israel, Who had fulfilled the promises made to their fathers, and had visited them that were sitting in darkness and the shadow of death, and had sent to them the light of salvation. Zacharias prophesied concerning the child also, saying that he would be a Prophet of the Most High and Forerunner of Jesus Christ. And the child John, who was filled with grace, grew and waxed strong in the Spirit; and he was in the wilderness until the day of his showing to Israel (Luke 1:57-80). His name is a variation of the Hebrew “Johanan,” which means “Yah is gracious.”
The wonderful story of the Forerunner’s conception and birth is told in the first chapter of the Gospel according to Luke. Together with the Most Holy Theotokos and Christ Himself, both his conception and his birth are commemorated as Feasts of the Church. His name, Johanan in Hebrew, means “The Lord is Gracious.”
The Prologue adds: “The news of the angel’s appearing to Zacharias, of his dumbness and of the loosening of his tongue at the exact moment that he wrote ‘John’, was carried throughout all Israel, coming to Herod’s ears. So, when he sent men to kill all the infants around Bethlehem, he sent men off to Zacharias’ family house in the hills, to slay John also. But Elisabeth hid the child in good time. The king was enraged at this, and sent an executioner to the Temple to kill Zacharias (for it was then his turn to serve in the Temple again). Zacharias was killed between the court and the Temple, and his blood clotted and solidified on the paving slabs, and remained as an enduring witness against Herod. Elisabeth hid herself and the child in a cave, where she soon died. The young John remained in the wilderness alone, in the care of God and His angels.”