Guttural R
Many Jewish immigrants to Israel spoke a variety of Arabic in their countries of origin and pronounced the Hebrew rhotic as an alveolar tap , similar to Arabic '. Gradually, many of them began pronouncing their Hebrew rhotic as a voiced uvular fricative , a sound similar or (depending on the Arabic dialect) identical to Arabic '. However, in modern Sephardic and Mizrahi poetry and folk music an alveolar rhotic continues to be used.
Dunash ibn Tamim
Moses ibn Ezra says that Ibn Tamim compares the two languages according to their lexicographical, not their grammatical, relations, and in this respect is less successful than Abu Ibrahim Ibn Barun at a later period. The latter also criticized certain details of Ibn Tamim's book. In the Yetzirah commentary Ibn Tamim says: "If God assists me and prolongs my life, I shall complete the work in which I have stated that Hebrew is the original tongue of mankind and older than the Arabic; furthermore, the book will show the relationship of the two languages, and that every pure word in the Arabic can be found in the Hebrew; that the Hebrew is a purified Arabic; and that the names of certain things are identical in both languages."