Numbers - Chapter 29

In this chapter we see the three autumn festivals - the fest of trumpets; the day of atonement; and the feast of tabernacles. The feast of tabernacles lasts for a week:

"On the fifteenth day of the same month, you must call another holy assembly of all the people, and you may do no ordinary work on that day. It is the beginning of the Festival of Shelters, a seven-day festival to the Lord."

Jesus went to Jerusalem during this feast (recorded in John 7).

"Not until halfway thought the Feast did Jesus go up to the temple courts and begin to teach."

At the end of the festival it was the tradition for the priests to draw water from the Pool of Siloam. Then they carefully poured it out praying for rain for the next year’s harvest.  This was when Jesus said the following:

"On the last day, the climax of the festival, Jesus stood and shouted to the crowds, “Anyone who is thirsty may come to me! Anyone who believes in me may come and drink! For the Scriptures declare, ‘Rivers of living water will flow from his heart.’”