JOHN 7:38

The Feast of Tabernacles was probably the most popular feast among the Jews. Because of its popularity, it was simply called The Feast (1Kings 8:2). It was celebrated to remember how God protected Israel in its travel across the wilderness to the Promised Land, providing the nation with manna and even water. During that seven-day festival, a priest stood in front of the Temple with a pitcher of water and poured the water on the altar. This action commemorated the water that came out of a rock which gave the Israelites water to drink. On the 8th day, no water is being poured out. People simply prayed publicly for continued rain.
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