How about the Offertory from Faure Requiem? You will need a good tenor soloist.
How about: Audivi vocem (Duarte Lobo)?
Audivi vocem in caelo dicentem mihi: 'Beati mortui qui in Domino moriuntur.'
I heard a voice from heaven saying unto me: Blessed are the dead which die in the Lord.
Text is from Revelation 14:13 and is also in the Office of the Dead.
It's 6 voices though, but not difficult and simply a magnificent piece.
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