Well according to today's standards, it's anti-Semitic and thus wrong if they hail from Eastern Europe. But if they're actual 100% Semitic and have been living in Semitic land since Semitic began but of an 'other' religion, anything goes, as long as you don't get the carpets too messy with blood.
So pretty much the same applied back then. Especially when back then the only God in the universe decided that he liked only the former and everybody else was detritus.