The angel told Zachariah that John the Baptist would come “in the spirit and power of Elijah.” (Luke 1:17). Indeed, Jesus confirms that John the Baptist is the expected Elijah. He told the disciples: “‘Elijah has already come, and they did not recognize him, but did to him whatever they pleased. So also, the Son of Man will certainly suffer at their hands.’ Then the disciples understood that he was speaking to them of John the Baptist.” (Matthew 17:11-13).

Birth of the Messiah
Since John the Baptist was born during the Passover, then Jesus had to have been born during the Feast of Tabernacles. There are six months between both feasts, and we are told Mary became pregnant six months after John’s mother, Elizabeth: