Jabal al-Lughat: Old Arabic in Greek letters, in 3rd/4th century Jordan
▻http://lughat.blogspot.com/2015/05/old-arabic-in-greek-letters-in-3rd4th.html
An article published this year (Al-Jallad and Al-Manaser 2015) reveals the oldest known fully vocalised Arabic inscription by far - written in Greek letters in northeastern Jordan, probably in the 3rd or 4th century AD. Here it is ▻https://www.academia.edu/12463830/Al-Jallad._2015._New_Epigraphica_from_Jordan_I_a_pre-Islamic_Arabic_inscri: New Epigraphica from Jordan I: a pre-Islamic Arabic inscription in Greek letters and a Greek inscription from north-eastern Jordan.