Semitic languages
The similarity of the Hebrew, Arabic and Aramaic languages was accepted by Jewish and Islamic scholars since medieval times. The languages were familiar to Western European scholars due to historical contact with neighbouring Near Eastern countries and through Biblical studies, and a comparative analysis of Hebrew, Arabic, and Aramaic was published in Latin in 1538 by Guillaume Postel. Almost two centuries later, Hiob Ludolf described the similarities between these three languages and the Ethiopian Semitic languages. However, neither scholar named this grouping as "Semitic".
Samaritan Hebrew
For the Samaritans, Ancient Hebrew ceased to be a spoken everyday language and was succeeded by Samaritan Aramaic, which itself ceased to be a spoken language some time between the 10th and 12th centuries and was succeeded by Arabic (or more specifically Samaritan Palestinian Arabic).