John 7:37-38 - If anyone is thirsty, let him come to Me and drink

On the last and greatest day of the Feast, Jesus stood and said in a loud voice, "If anyone is thirsty, let him come to me and drink. Whoever believes in me, as the Scripture has said, streams of living water will flow from within him."

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. He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water.

Now on the last day, the great day of the feast, Jesus stood and cried out, saying, "If anyone is thirsty, let him come to Me and drink. "He who believes in Me, as the Scripture said, 'From his innermost being will flow rivers of living water.'"

John 7:37-38

Commentary

On each day of the feast (the Jewish Feast of Tabernacles), the people came with palm branches and marched around the great altar. A priest took a golden pitcher filled with water from the Pool of Siloam, carried it to the temple, and poured it on the altar as an offering to God. This dramatic ceremony was a memorial of the water that flowed from the rock when the Israelites traveled through the wilderness. Perhaps at the very moment that the priest was pouring water on the altar, Jesus' voice rang out: If anyone thirsts, let him come to Me and drink.
Jesus' timing couldn't have been more perfect or His claim more explicit: He was declaring Himself to be none other than the long-awaited Messiah who would pour out the Holy Spirit, as many in the crowd immediately recognized (7:39-43). In many ways 7:37 acts as the pivot for John's account. From that point on, the hostility of Jesus' enemies mounted until they finally arrested Him (18:12) in vain hopes of shutting off the "living water."

Radmacher, E. D., Allen, R. B., & House, H. W. (1999). Nelson's new illustrated Bible commentary (Jn 7:37-39). Nashville: T. Nelson Publishers.

John 1:16-18 - Grace and truth came through Jesus Christ

From the fullness of his grace we have all received one blessing after another. For the law was given through Moses; grace and truth came through Jesus Christ. No one has ever seen God, but God the One and Only, who is at the Father's side, has made him known.

And of his fulness have all we received, and grace for grace. For the law was given by Moses, but grace and truth came by Jesus Christ. No man hath seen God at any time, the only begotten Son, which is in the bosom of the Father, he hath declared him.

For of His fullness we have all received, and grace upon grace. For the Law was given through Moses; grace and truth were realized through Jesus Christ. No one has seen God at any time; the only begotten God who is in the bosom of the Father, He has explained Him.

John 1:16-18

Commentary

The law, given by Moses, was not a display of God's grace but God's demand for holiness. God designed the law as a means to demonstrate the unrighteousness of man in order to show the need for a Savior, Jesus Christ (Rom. 3:19, 20; Gal. 3:10-14, 21-26). Furthermore, the law revealed only a part of truth and was preparatory in nature. The reality or full truth toward which the law pointed came through the person of Jesus Christ.

MacArthur, J. J. (1997, c1997). The MacArthur Study Bible (electronic ed.) (Jn 1:17). Nashville: Word Pub.

No one has seen God?

God is Spirit (4:24) and is invisible (Col. 1:15, 1 Tim. 1:17) unless God chooses to reveal Himself. Humans cannot look at God and live (Ex. 33:20). Abraham, the friend of God, did not see God. Even Moses, the lawgiver, could not look at God's face (Ex. 33:22, 23). However, the Son is in intimate relationship with the Father, face-to-face with God (1:1; 6:46; 1 John. 1:2). God became visible to human eyes in the man Jesus. It is through seeing the Son that we see God. We cannot see Him today, but we know Him through His word.

Radmacher, E. D., Allen, R. B., & House, H. W. (1999). Nelson's new illustrated Bible commentary (Jn 1:18). Nashville: T. Nelson Publishers.