Prior to Islam, Central Oman lay outside of the core area of spoken Arabic. Possibly Old South Arabian speakers dwelled from the Bāṭinah to Ẓafār. Rare Musnad inscriptions have come to light in central Oman and in the Emirate of Sharjah, but the script says nothing about the language which it conveys. A bilingual text from the 3rd century BCE is written in Aramaic and in musnad Hasiatic, which mentions a 'king of Oman' (mālk mn ʿmn). Today the Mehri language is limited in its distribution to the area around Ṣalālah in Ẓafār and westward into the Yemen. But until the 18th or 19th century it was spoken further north, perhaps into Central Oman. Baluchi (Southern Baluchi) is widely spoken in Oman. Endangered indigenous languages in Oman include Kumzari, Bathari, Harsusi, Hobyot, Jibbali and Mehri. Omani Sign Language is the language of the deaf community. Oman was also the first Arab country in the Persian Gulf to have German taught as a second language. The Bedouin Arabs, who reached eastern and southeastern Arabia in migrational waves—the latest in the 18th century, brought their language and rule including the ruling families of Bahrain, Qatar and the United Arab Emirates.