The fourth choice for a Sprinkling Rite antiphon in the Roman Rite’s Easter Season comes from the New Testament. The context is the first letter of Peter, chapter 2 verse 9, part of a larger discourse on God’s house, built of living stones, God’s own people.
The words of the antiphon are these:
O chosen race, royal priesthood, holy nation,
proclaim the mighty works of him
who called you out of darkness into his wonderful light, alleluia.
The passage touches on a few other Biblical passages, Ex 19:6; Is 61:6; Rev 1:6; 20:6. and this might suggest an additional text for the cantor: perhaps one of the Christological passages in the book of Revelation, or even the 61st chapter of Isaiah.
Those suggestions aside, I’ve never experienced a setting of this. They exist, no doubt. I suspect the text may be less inspiring to composers, but not because the expression is untrue or difficult. It’s more of a catechetical teaching than a lyric expression of faith. Maybe Liam knows of something from the Ted Marier opera, or Charles from the reform2 orbit.