This is a reference to the Feast of Tabernacles, the third of the three great feasts (Passover, Weeks, and Tabernacles). The Feast of Tabernacles reflected on the period of more than forty years during which Israel lived in tents. It is also known as “the feast of the Lord” (Leviticus 23:39), and was the most important and best attended of the pilgrimages. At the final day many people would be gathered in the temple precincts to be joyful and receive the blessing. In recognition of this importance, within both the Old Testament (Ezekiel 45:25) and New Testament it was sometimes called simply “the feast.”1
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.