"37 On the last day of the feast, the great day, Jesus stood up and cried out, “If anyone thirsts, let him come to me and drink. 38 Whoever believes in me, as the Scripture has said, ‘Out of his heart will flow rivers of living water.’”39 Now this he said about the Spirit, whom those who believed in him were to receive, for as yet the Spirit had not been given, because Jesus was not yet glorified.
40 When they heard these words, some of the people said, “This really is the Prophet.” 41 Others said, “This is the Christ.” But some said, “Is the Christ to come from Galilee? 42 Has not the Scripture said that the Christ comes from the offspring of David, and comes from Bethlehem, the village where David was?” 43 So there was a division among the people over him. 44 Some of them wanted to arrest him, but no one laid hands on him."
John 7:37-44
A careful examination of the chronology of Luke 1 reveals a deeply interesting fact, which we may now consider in relation to the Feast of Tabernacles. Luke tells us that Zacharias was 'of the course of Abia (Abijah)'. The record of all the temple courses is given us in 1 Chronicles 24:7-19, where we learn that there were 24 in all in the annual rote, i.e. one each fortnight. The eighth course, that of Abia, would therefore fall in the second fortnight of the fourth month, which fell in our June/July period. It was then that John the Baptist was conceived in the womb of Elizabeth, who, we are told in Luke 1:24, hid herself for five months. Then in the sixth month - i.e. six months after Elisabeth's experience, the angel Gabriel appeared to Mary foretelling the birth of Jesus. This, the sixth month after Elizabeth's experience, makes it the tenth month of the Jewish year; which means that the birth of Jesus took place in the second half of the seventh month of the Jewish calendar, i.e. at the time of the Feast of Tabernacles which, as Leviticus 23:34 tells us, was celebrated from the 15th to the 21st of the seventh month. It is surely not without significance that the Son of God was born at the time of the Feast of Tabernacles, and may well have been born on the last great day of the Feast itself. The association of ideas here is very wonderful, and even John's statement in 1:14 about the Word being made flesh takes a new significance when we recall that the word 'dwelt' literally reads 'tabernacled among us' in the Greek. Is not this to us a proclamation that His Incarnation, His birthday, is the fulfilment of the meaning and purpose of the ancient Feast? And what must it have meant to His own inner self-consciousness, as He celebrated His birthday at the Feast?