Long before Calvary, Jesus predicted that His then-still-future enthronement would immediately be followed by the Acts 2:33 outpouring of His Holy Spirit. For, when a thirsty woman came to a well to draw water, Jesus said: "Whosoever keeps on drinking of the water which I shall give him, shall never stay thirsty. But the water which I shall [then] keep on giving him, shall become, inside of him, a fountain of water. It shall keep on gushing forth, unto everlasting life." John 4:14.
Jesus also spoke to the multitudes at the Feast of Tabernacles — before and about those same later events of Pentecost Sunday. Said Christ: "If any man keeps on getting thirsty, let him keep on coming to Me — and keep on drinking [from Me]! He who keeps on believing in Me — as the Scripture has said — rivers of living water shall keep on gushing forth from within him."