najis
...that in Persia, non-Muslims were considered to be najis (ritually unclean) by Shi'a Muslims, and were not allowed to go outside in rain or snow for fear that some impurity could be washed from them onto a Muslim?
...that in <a class="mw-redirect" href="./Persia" id="mwBus" rel="mw:WikiLink" title="Persia">Persia</a>, <a href="./Kafir" id="mwBuw" rel="mw:WikiLink" title="Kafir">non-Muslims</a> were considered to be <i id="mwBu0"><b id="mwBu4"><a href="./Najis" id="mwBu8" rel="mw:WikiLink" title="Najis">najis</a></b></i> (ritually unclean) by <a class="mw-redirect" href="./Shi'a_Islam" id="mwBvA" rel="mw:WikiLink" title="Shi'a Islam">Shi'a</a> <a class="mw-redirect" href="./Muslim" id="mwBvE" rel="mw:WikiLink" title="Muslim">Muslims</a>, and were not allowed to go outside in rain or snow for fear that some impurity could be washed from them onto a Muslim?