Understanding the timing of Jesus’ birth begins long before Mary conceived. The story actually starts with Zechariah, the father of John the Baptist. Scripture tells us that Zechariah was a priest “of the course of Abijah” (Luke 1:5), a detail that may seem minor but is actually a key to understanding the seasonal timeline of the births of both John and Jesus. By studying the priestly courses established in the Old Testament, we discover that Zechariah’s service in the Temple took place around June, creating a clear chronological foundation for the biblical nativity timeline.
The priestly service rotations were established under King David. First Chronicles describes twenty–four priestly divisions, each assigned to serve in the Temple for a specific period. The “course of Abijah” is listed as the eighth of these rotations (1 Chronicles 24:10). These courses rotated weekly, beginning in the first month of the Hebrew religious calendar (Nisan), which corresponds to March or April on the modern calendar. By counting the weekly order and considering that all priests also served together during the major annual festivals. Bible historians and scholars conclude that the eighth course, Abijah’s course, served its regular rotation in early June.
Luke tells us that Gabriel appeared to Zechariah “while he executed the priest’s office before God in the order of his course” (Luke 1:8). Zechariah was performing Temple duties, burning incense, and praying inside the holy place when the angel delivered the message that Elizabeth would bear a son. As soon as Zechariah completed his service and returned home, Scripture says Elizabeth conceived (Luke 1:23–24). This places John the Baptist’s conception shortly after Zechariah’s June service period.
Once we recognize that Elizabeth conceived in June, Scripture gives the next link in the timeline. Luke records that “in the sixth month” of Elizabeth’s pregnancy, Gabriel was sent again this time to Mary in Nazareth (Luke 1:26). That means Mary conceived Jesus six months after Elizabeth, which places the conception of Christ in December, and His birth nine months later in early autumn, not winter.
Zechariah’s June service is more than a historical footnote; it is a foundational part of the biblical timeline. God established the priestly courses centuries earlier, and those same courses became the calendar markers by which the timing of the Messiah’s arrival can be traced. The precision of Scripture is remarkable. What seems like a small detail Zechariah belonging to the course of Abijah becomes a significant piece of evidence when paired with the angelic announcements described in Luke.
By placing Zechariah’s priestly service in June, the Bible lays out a timeline that confirms John’s birth in the spring and Jesus’ birth in the fall. This aligns with the other biblical and historical clues: shepherds in the fields at night, the Roman census timing, weather conditions, and Mary’s journey. All of these support what the priestly courses already reveal Jesus was not born in December.
Zechariah’s service in June stands as one of the clearest chronological anchors God placed in His Word. It quietly guides careful readers toward the truth, revealing that the traditions surrounding December 25 do not reflect the timing given in Scripture. Instead, the biblical evidence consistently points to a carefully ordered and prophetically aligned season for the birth of Christ, one that begins with a priest in the Temple in the early summer, carrying out his duties during the course of Abijah.