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The liturgical feast is primarily based on a passage from the book of Revelation, where a large heavenly host of people is seen by St. John the Apostle.
The observance of All Saints Day has roots in the early Roman Church as well as in the Bible itself.
On May 13, 610, Pope Boniface IV consecrated the Pantheon, a former Roman temple, giving it the new title of St. Mary and the Martyrs.
When the Pantheon was first consecrated as a Christian church, many relics of Roman martyrs were brought there from the catacombs, which helps explain its original name. Later, the title of the church was broadened to St. Mary and All the Saints, but the feast commemorating its dedication remained on May 13.
Then on November 1, 735, Pope Gregory III dedicated a chapel in St. Peter’s Basilica to a variety of saints, making it a privileged feast day in the city of Rome. Shortly thereafter Pope Gregory IV established November 1 as a holy day of obligation in the universal Church dedicated to All Saints.
Continued below.
The observance of All Saints Day has roots in the early Roman Church as well as in the Bible itself.
On May 13, 610, Pope Boniface IV consecrated the Pantheon, a former Roman temple, giving it the new title of St. Mary and the Martyrs.
When the Pantheon was first consecrated as a Christian church, many relics of Roman martyrs were brought there from the catacombs, which helps explain its original name. Later, the title of the church was broadened to St. Mary and All the Saints, but the feast commemorating its dedication remained on May 13.
Then on November 1, 735, Pope Gregory III dedicated a chapel in St. Peter’s Basilica to a variety of saints, making it a privileged feast day in the city of Rome. Shortly thereafter Pope Gregory IV established November 1 as a holy day of obligation in the universal Church dedicated to All Saints.
All Saints Day in the Bible
Continued below.

Where is All Saints Day in the Bible?
The liturgical feast is primarily based on a passage from the book of Revelation, where a large heavenly host of people is seen by St. John the Apostle.
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