All Saints, Second Vespers, Antiphon to the Magnificat - cf. Revelation 7:9

O quam gloriosum est regnum,
in quo cum Christo gaudent omnes Sancti!
Amicti stolis albis,
sequuntur Agnum, quocumque ierit.

O, how glorious is the kingdom,
in which all the saints rejoice with Christ!
Arrayed in white robes,
they follow the Lamb, wherever he goes.