The Pentecost Novena is the first of all novenas, nine days of prayer. After Jesus' Ascension into heaven, He commanded His disciples to come together in the upper room to devote themselves to constant prayer (Acts 1:14). They prayed for nine days before receiving the Holy Spirit on Pentecost.
On May 4, 1897, Pope Leo XIII proclaimed: "We decree and command that throughout the whole Catholic Church, this year and in every subsequent year, a novena shall take place before Whit-Sunday (Pentecost), in all parish churches." It has been reported that Pope Leo XIII was inspired to mandate the Pentecost novena because of a letter from a housewife in Italy. Pope John Paul II has reiterated Pope Leo XIII's command for a worldwide Pentecost novena, although the novena can be prayed at any time — not only before Pentecost.
Click the link below for the Holy Spirit Novena asking for an outpouring of the Fruits of the Holy Spirit.