The text “Exsultate Justi in Domino” (Rejoice in the Lord, O ye righteous) originates from the ancient Hebrew book of Psalms, specifically the opening verses of Psalm 33 (numbered as Psalm 32 in the Greek Septuagint and Latin Vulgate traditions). Historically attributed to King David, this poetic call to worship serves as a joyous hymn of praise, exhorting believers to celebrate divine justice, truth, and creation. The verses explicitly command the faithful to sing a “new song” and accompany their voices with instruments like the lyre, harp, and ten-stringed psaltery, reflecting the vibrant musical traditions of ancient Israel.

As the Hebrew Bible was translated into Greek and subsequently into Latin by Saint Jerome in the late 4th century, the text officially entered the Roman Catholic liturgy. For centuries, these Latin verses held a prominent place in the Christian calendar, most notably serving as the Introit—the opening chant—for the Feast of All Saints, celebrated on November 1. It was also frequently utilized for the common feasts of multiple martyrs, symbolizing collective righteous joy in the face of tribulation. During the Middle Ages and early Renaissance, the text was primarily sung as monophonic Gregorian chant, passing down through generations of monastic copying.

The text’s historical trajectory shifted dramatically at the dawn of the 17th century through the work of Ludovico da Viadana, an Italian Franciscan friar and choirmaster. In 1602, Viadana published his Concerti ecclesiastici, Op. 12, which included a brilliantly energetic, four-part polyphonic setting of “Exsultate Justi.” Viadana’s composition was revolutionary; it embraced early Baroque sensibilities by using crisp, rhythmic word-painting to mimic the ancient stringed instruments mentioned in the text. His setting became a staple of sacred choral repertoire, ensuring the text remained living art rather than static Scripture.