John 7:37-38

Verse 37

In the last day, that great day of the feast - This was the eighth day, and was called the great day, because of certain traditional observances, and not on account of any excellence which it derived from the original institution. On the seven days they professed to offer sacrifices for the seventy nations of the earth, but on the eighth day they offered sacrifices for Israel; therefore the eighth day was more highly esteemed than any of the others. It is probably to this that the evangelist refers when he calls the last day the great day of the feast. See the account of the feast of tabernacles, in the note on Joh 7:2 (note). It was probably when they went to draw water from the pool Siloam, and while they were pouring it out at the foot of the altar, that our Lord spoke these words; for, as that ceremony pointed out the gracious influences of the Holy Spirit, our Lord, who was the fountain whence it was to proceed, called the people to himself, that, by believing on him, they might be made partakers of that inestimable benefit.
Verse 38

He that believeth on me, as the Scripture hath said - He who receives me as the Messiah, according to what the Scripture has said concerning me; my person, birth, conduct, preaching, and miracles, being compared with what is written there as ascertaining the true Messiah. Out of his belly - from his heart and soul; for in his soul shall this Spirit dwell.

Living water - As a true spring is ever supplied with water from the great deep, with which it has communication, so shall the soul of the genuine believer be supplied with light, life, love, and liberty, and all the other graces of the indwelling Spirit, from the indwelling Christ. The Jews frequently compare the gifts and influences of the Holy Spirit to water in general - to rain, fountains, wells, rivers, etc., etc. The Scriptures abound in this metaphor. Psa 36:8, Psa 36:9; Isa 44:3, Isa 44:4; Joe 2:23.
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