From our ongoing collection: Golden Age Classics for SAB Choir. Smaller choirs DESERVE to sing these! SAB a cappella with optional accompaniment.
The collect for the Third Sunday of Advent from the Book of Common Prayer, 1549. (Yes, back when Advent was serious business ...) Still, this is a wonderful piece for your small choir anytime of year, arranged artfully by Prof. Thoburn. You could use this as an introit as well. How about your Advent Lessons and Carols?
Lord, we beseech thee,
give ear unto our prayers,
and by thy gracious visitation
lighten the darkness of our hearts,
by our Lord Jesus Christ.