Saudi Arabia
The official language of Saudi Arabia is Arabic. The three main regional variants spoken by Saudis are Hejazi Arabic (about 6 million speakers), Najdi Arabic (about 8 million speakers), and Gulf Arabic (about 0.2 million speakers). Saudi Sign Language is the principal language of the deaf community. The large expatriate communities also speak their own languages, the most numerous of which are Tagalog (700,000), Rohingya (400,000), Urdu (380,000), Egyptian Arabic (300,000), and Indonesian (250,000).
Levantine Arabic
Ancient Arabia was home to a continuum of Central Semitic languages in antiquity which stretched from the southern Levant to Yemen. The isoglosses associated with Arabic are clustered at the northern end of this continuum, in the northern Hijaz and the southern Levant. This may be in part due to a lack of documentation, but it is clear that Central Arabia was home to languages quite distinct from Arabic. Thus, Arabic can be said to have emerged in the second millennium BC and spread into the peninsula, replacing its sister languages on the Central Semitic continuum.