Sunday of All Saints

"The first Sunday after the Feast of Holy Pentecost is observed by the Orthodox Church as the Sunday of All Saints.  This day has been designated as a commemoration of all of the Saints, all the Righteous, the Prophets, Apostles, Martyrs, Confessors, Shepherds, Teachers, and Holy Monastics, both men and women alike, known and unknown, who have been added to the choirs of the Saints and shall be added, from the time of Adam until the end of the world, who have been perfected in piety and have glorified God by their holy lives." https://www.goarch.org/-/sunday-of-all-saints

Adorned in the blood of Your Martyrs throughout all the world as in purple and fine linen, Your Church, through them, does cry unto You, O Christ God, "Send down Your compassion upon Your people; grant peace to Your commonwealth, and great mercy to our souls." (Apolytikion for the Feast of All Saints)