Os justi meditabitur [The mouth of the righteous speaks wisdom] (Psalm 37:30-31,1) – Gregorian chant
30 The mouth of the righteous speaketh wisdom, and his tongue talketh of judgment.
31 The law of his God is in his heart; none of his steps shall slide.
1 Fret not thyself because of evildoers, neither be thou envious against the workers of iniquity.
Sung by the Coro Gregoriano De Lisboa
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Liber Usualis (p. 1200-1201) [pdf]