A little historical perspective that the priests performed a symbolic ceremony by holding willow branches to make the swishing sound as a representative of God's Spirit coming upon the city and temple during the Feast. A golden vase used to pour out water libation on the altar that became known as living water. Jesus spoke and emphasized during this ceremony at the Feast (on the 8th day) that it points to the true, living waters; Him, as the true Savior. It was prophetic, and that He was declaring that He was the fulfillment of that ritual. Jesus spoke at the Feast that He is the true, living water representing everlasting life if we thirst for Him.