Ironically, Yiddish was a language born of Haifa and arrogance, not of kodesh.
There is a good reason that it is based upon midieval German. In the fifteenth and sixteenth centuries German Jewry was suffering persecution and many responded to the offer of the Polish kings to move to Poland. At that time Poland ruled the Ukraine and what is now western Russia and the Polish kings saw the Jews as an instant mercantile class. However, being Germans, the Jews refused to speak the what they viewed as thecrude Slavic language of the poles and continued speaking their midieval German which evolved into Yiddish