Nisi Dominus, RV 608, is a musical setting by Antonio Vivaldi of Psalm 127 (Vulgate 126), intended for Vespers. His score, written c. 1715, calls for alto voice, strings and organ or harpsichord.[1] The alto part may be taken by (female) contralto or (male) countertenor.
Vivaldi would again set this psalm, but with three voice-parts and orchestral accompaniment (RV 803), in 1739.[2][3]