Sorry what? Palestinian Arabic is what people no matter if Jewish, Christian, Druze, Muslim, … have been speaking in Palestine. People haven’t been speaking Hebrew there since some thousands of years save for religious purposes.

Historical records testify to the existence of Hebrew from the 10th century BCE[4] to the late Second Temple period (lasting to 70 CE), after which the language developed into Mishnaic Hebrew. From about the Babylonian Captivity in the 6th century BCE until the Middle Ages, many Jews spoke Aramaic, a related Semitic language. From the 2nd century CE until the revival of Hebrew as a spoken language circa 1880, Hebrew served as a literary and official language and as the Judaic language of prayer.[5] After the spoken usage of Mishnaic Hebrew ended in the 2nd century CE, Hebrew had not been spoken as a mother tongue.

…wikipedia.org/…/Revival_of_the_Hebrew_language