The Catechism in Questions & Answers

518. Does the Old Testament contain any references to the outpouring of the Holy Spirit in the New Testament?

Yes, the Old Testament contains several references (for example, Ezekiel 36: 27) indicating that God’s Spirit would be poured out over many people. An important reference to this can be found in Joel 2: 28-29: “And it shall come to pass afterward that I will pour out My Spirit on all flesh; your sons and your daughters shall prophesy, your old men shall dream dreams, your young men shall see visions. And also on My menservants and on My maidservants I will pour out My Spirit in those days” (see also Acts 2: 15 et seq.).