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).
Hasaitic dialect
Hasaitic is an Ancient North Arabian dialect attested in inscriptions in the Eastern Province of Saudi Arabia at Thaj, Hinna, Qatif, Ras Tanura, Abqaiq in the al-Hasa region, Ayn Jawan, Mileiha and at Uruk.
It is written in the Ancient North Arabian script and dates from the 3rd to 2nd centuries BC.