While in the synagogue of his hometown of Nazareth, Jesus claims the words of the prophet Isaiah as his own: “The Spirit of the Lord is upon me, because he has anointed me to bring glad tidings to the poor. He has sent me to proclaim liberty to captives and recovery of sight to the blind, to let the oppressed go free, and to proclaim a year acceptable to the Lord” (Luke 4:18-19). This “year acceptable to the Lord” refers to a jubilee, which according to the Scriptures of Israel, is to occur every fiftieth year as a special time of grace in which debts are cancelled and laborers are released (Lev 25:8-22).
Since 1300, the Church has celebrated jubilee years, or holy years, to commemorate occasions of significance in the history of salvation. Ordinary jubilee years occur every 25 years, though the pope can proclaim an extraordinary jubilee year, as with the Jubilee Year of Mercy in 2016. Every jubilee is “an outpouring of divine mercy” (Spes Non Confundit 5), a time of prayer, pilgrimage, and pardon.