Towards Understanding the Status of the Dual in Pre-Islamic Arabic

This article suggests that the dual suffix in pre-Islamic Arabic did not differentiate for case. Tamīm, one of the most trustworthy pre-Islamic dialects, treated the dual suffix invariably although it had a full case system. There are also tokens of the same invariable treatment in the Qurʾān. The article proposes that the suffix long vowel variation due to the phenomenon of ʾimāla makes the formal origin of the invariable dual suffix difficult to ascribe to the East and Northwest Semitic oblique dual allomorph.