The Brazilians say this comes from Psalm 27, vv 8-9, and 1, which are these:
8 My heart says of you, "Seek his [b] face!"
Your face, LORD, I will seek.
9 Do not hide your face from me,
do not turn your servant away in anger;
you have been my helper.
Do not reject me or forsake me,
O God my Savior.
1 The LORD is my light and my salvation—
whom shall I fear?
The LORD is the stronghold of my life—
of whom shall I be afraid?
Here's the score, from JoguesChant, which gives the translation as:
My heart declared to you: "Your countenance have I sought; I shall ever seek your countenance, O Lord; do not turn your face from me." The Lord is my light and my salvation; whom shall I fear?
Second, here's a pretty "early music" version of the first verse of Quicumque Christum queritis, a Transfiguration hymn for Matins and Vespers:
I've written about this hymn before; the words in Latin and English are at that link.
The caption at the YouTube page reads:
This video of a colonial Mexican song came from a performance of the Nashville Early Music Ensemble at Christ Church Cathedral in Downtown Nashville, TN on Tuesday, December 4. The Concert was entitled Feliz Navidad Canciónes de América Latina. The ensemble is designed to perform the vocal and instrumental music of the Medieval and Renaissance periods as well as traditional folk music from several world cultures. The twenty-member ensemble features musicians with diverse music backgrounds but all with experience in early music. The instruments featured in the concert will be viols, violin, rebec, lute, ud, guitars, psaltery, harp, recorders, and a wide variety of percussion. The director is Dr. Gerald Moore, a retired music professor from Lipscomb University, who taught music theory and directed the Lipscomb Early Music Consort for over twenty-five years. For more information on the NEME, visit their website at http://nashvilleearlymusic.blogspot.com