When Jesus celebrated the Feast of Tabernacles, He made one of His greatest and most profound announcements about His identity as Messiah (John 7). On the seventh day of the feast, it was the custom of Jewish people during this period to send a group of Levities accompanied by musicians to the pool of Siloam to gather running water in giant vessels to bring to the altar.
They would march around the altar crying out, “Lord, save us! Lord, save us!” many times. Then, they would pour the water from the vessels at the base of the altar. This act symbolized the hope of the Jewish people looking toward the day when Messiah would come and pour His Spirit upon the people of Israel in fulfillment of Joel 2:28–29:
It will come about after this that I will pour out My Spirit on all mankind: and your sons and daughters will prophesy, your old men will dream dreams, your young men will see visions. Even on the male and female servants I will pour out My Spirit in those days.
According to Jewish tradition, these events in Joel were to take place when the Messiah appeared on earth. This pouring out of the water at the base of the altar in the Temple was a foretaste of the outpouring of God’s Spirit. The water-drawing ceremony, as it was known, was a portrait of the day when God would send His Messiah and His Spirit, causing the Jewish people to come alive spiritually as never before.
Jesus understood this tradition; therefore, on the seventh great day of the feast, He stood up and said:
“If anyone is thirsty, let him come to Me and drink. He who believes in Me, as the Scripture said, ‘From his innermost being will flow rivers of living water.’” But this He spoke of the Spirit, whom those who believed in Him were to receive; for the Spirit was not yet given, because Jesus was not yet glorified. (John 7:37b–39)
The Feast of Tabernacles is one of the three biblical festivals on which God required Jewish men to visit Jerusalem. As a result, crowds of Jewish people from around the world were present to hear Jesus make this statement. Jesus was telling the masses He was the Messiah, the Spirit of God was about to be poured out, and He was the living water to which He referred. Those who drink—who believe in Him—will never thirst again!