On the great day of the feast, Jesus stands and cries out to the thirsty to come to him and drink. The saying occurs at Tabernacles, a festival whose later documented Temple ceremonies included a prominent water-pouring rite.
The setting gives Jesus' words a powerful historical backdrop while requiring care about the exact development of the ritual.
Later Jewish tradition, especially the Mishnah, describes water drawn from the Pool of Siloam and carried in procession to the Temple for libation during Tabernacles. The autumn festival also stood near the beginning of the rainy season, making prayer for water and divine provision especially appropriate. Because the fullest descriptions are later, scholars appropriately debate how precisely every detail can be projected into Jesus' day.
John himself unquestionably places the saying at Tabernacles and emphasizes thirst, drinking, and living water.
The festival context makes Jesus' invitation startling. In a celebration filled with biblical memories of God's wilderness provision and, very plausibly, public water symbolism, Jesus directs the thirsty to himself.
The claim continues the pattern already seen with the Samaritan woman: divine life-giving water is not merely a resource Jesus points toward; it is received through coming to him.