What is the source of the phrase "a sach yiddishe nachas" ?
Why specify 'jewish' ?
What is the source of the phrase "a sach yiddishe nachas" ?
Why specify 'jewish' ?
Beraishis 36 (13) shows that Nachas was a grandson of Eisav and son of Reuel.
יג וְאֵלֶּה בְּנֵי רְעוּאֵל נַחַת וָזֶרַח שַׁמָּה וּמִזָּה אֵלֶּה הָיוּ בְּנֵי בָשְׂמַת אֵשֶׁת עֵשָֽׂו:
13 And these are the sons of Reuel: Nahath, Zerah, Shammah, and Mizzah. These are the sons of Basemath, the wife of Esau.
While we wish for nachas, we don't want a grandson of Eisav and so we want “yiddishe nachas”.