Isaiah 41:24

Your work of naught "Your operation is less than naught" - For מאפע meepha , read מאפס meephes ; so the Chaldee and Vulgate. A manifest error of the text; compare Isaiah 40:17 . The rabbins acknowledge no such error, but say that the former word signifies the same with the latter, by a change of the two letters ס samech and ע ain . - Sal ben Melec in loc.