As the popular use of Aramaic was gradually restricted by the spread of Arabic as the vernacular (from the 7th century onwards), while the dispersion of the Jews became wider, biblical Hebrew again came to be the natural standard both of East and West.
After Biblical Hebrew a later form of the language was used by the early rabbis in their voluminous writings.
Yiddish is referred to as the "mother tongue," while Biblical Hebrew and Aramaic are called the "holy tongue."