The psalm setting Credidi, propter quod locutus sum, RV 605, is a curiosity among Antonio Vivaldi’s sacred vocal works: in truth, it is an arrangement of an arrangement. The basis for this work was an anonymus Lauda Jerusalem, (RGH Anh. 35) for which Vivaldi chose a new text and also composed a new verse. Exactly when and for whom Credidi was written remains a matter of speculation. Composed in the stile antico, this work for five voices spanning roughly 150 measures is a welcome addition to the choral and ensemble repertoire while simultaneously offering insights into the art and practice of arranging in the eighteenth century.