Here's a PDF of the score, from JoguesChant. And here's an image of it from the Benedictines of Brazil:
The text is from Psalm 31:
Be unto me a protecting God and a house of refuge, to save me; for you are my support and my refuge; and for the sake of your name you will lead me and nourish me. In you O Lord, do I trust; let me never be put to shame; deliver me in your righteousness.