On Ascension Thursday, we commemorate that day when Jesus, some 40 days after His resurrection, ascended into heaven at the right hand of the Father. In his final instructions to the early Church, he commanded them to stay in Jerusalem and pray, awaiting the gift of the Holy Spirit (Acts of the Apostles 1). The early believers, gathered around Mary, prayed for nine days. The ninth day was the Jewish feast of Pentecost. The Holy Spirit was poured out upon the early Church.
This amazing historical event inspired Christians to pray special prayers for nine days, also known as a novena. Follow this link to find a beautiful novena for a new outpouring of the Holy Spirit in your life: Novena to the Holy Spirit.