ealra sancta symbel: the Feast of All Saints, All Saints’ Day. (“ay-al-rah sahnk-tah sum-bell”)

Further information from Kazutomo Karasawa’s The Old English Metrical Calendar (Menologium) (Cambridge, 2015):

And þy ylcan dæge   ealra we healdað / sancta symbel   þara þe sið oððe ær / worhtan in worulde   willan drihtnes.

—The Old English Metrical Calendar (Menologium), lines 199-201

And on the same day, we hold the feast of all saints who ever worked God’s will in the world.

—translation by K. Karasawa

The Forerunners of Christ with Saints and Martyrs, by Fra Angelico (c. 1423-1424). National Gallery, London. [Wikipedia]