“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 9, 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.” (Encyclical Pope Leo XIII On the Holy Spirit, DIVINUM ILLUD MUNUS )
NOVENA TO THE HOLY SPIRIT FOR THE SEVEN GIFTS