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.
Arabic definite article
While the Proto-Semitic language did not have any articles, the most likely theory is that the article "al"- comes from the same proto-Semitic source as the Hebrew definite article "ha-". That theory is based primarily on the fact that the two share many similarities. Both particles are prefixed to nouns, and both geminate with certain following letters. Moreover, neither particle is prefixed to non-final nouns in a genitival construction. Finally, both are prefixed to relative clauses. According to David Testen, many northern and southwestern Semitic languages have particles that bear similarities to "al"-. With this fact, he posits that "al"- has a proto-Semitic antecedent.