An Etymological Dictionary of the German Language/Annotated/zwar

zwar, adverb, ‘indeed, truly, of course,’ from Middle High German zwâre, ze wâre, ‘in truth,’ Old High German zi wâre (Middle High German wâr, neuter, ‘truth,’ an adjective used as a substantive). Connected, like fürwahr (Middle High German vür war, ‘truly), with wahr.