Albert Barnes on John 7:37

In the last day, that great day of the feast, Jesus stood and cried, saying, If any man thirst, let him come unto me, and drink. John 7:37

In the last day – The eighth day of the festival.

That great day – The day of the holy convocation or solemn assembly, Lev. 23:36. This seems to have been called the great day:

  1. because of the solemn assembly, and because it was the closing scene.
  2. because, according to their traditions, on the previous days they offered sacrifices for the pagan nations as well as for themselves, but on this day for the Jews only (Lightfoot).
  3. because on this day they abstained from all servile labor Lev. 23:39, and regarded it as a holy day.
  4. On this day they finished the reading of the law, which they commenced at the beginning of the feast.
  5. because on this day probably occurred the ceremony of drawing water from the pool of Siloam.

On the last day of the feast it was customary to perform a solemn ceremony in this manner: The priest filled a golden vial with water from the fount of Siloam (see the notes at John 9:7), which was borne with great solemnity, attended with the clangor of trumpets, through the gate of the temple, and being mixed with wine, was poured on the sacrifice on the altar. What was the origin of this custom is unknown. Some suppose, and not improbably, that it arose from an improper understanding of the passage in Isa. 12:3; “With joy shall ye draw water out of the wells of salvation.” It is certain that no such ceremony is commanded by Moses. It is supposed to be probable that Jesus stood and cried while they were performing this ceremony, that he might:

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