The Minaean language was an Old South Arabian

Old South Arabian

Old South Arabian is the term used to describe four extinct, closely related languages spoken in the far southern portion of the Arabian Peninsula. There were a number of other Sayhadic languages , of which very little evidence survived, however...

 ("Sayhadic") language spoken in Yemen between 1200 BC and AD 100. The main area of its use may be localized in al-Jawf part of North-East Yemen, first of all in the Wadi Madhab. Most of the texts in this language were composed by the Minaeans

Minaeans

The Minaeans from Arabic or were an ancient Arab group in Yemen during the 1st millennium BC. Their Minaean Kingdom was one of important kingdoms in ancient Yemen and Southwestern Arabia...

, but the other civil-temple communities of the Wadi Madhab (Nashshan, Kaminahu, Haram, and Inabba') also used this language.