These [Mitanni] numerals and divine and personal names are the oldest actual specimens of any Aryan speech which we possess. The forms deserve specia… - Vere Gordon Childe

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These [Mitanni] numerals and divine and personal names are the oldest actual specimens of any Aryan speech which we possess. The forms deserve special attention. They are already quite distinctly Satem forms ; in fact, they are very nearly pure Indic. Certainly they are much more nearly akin to Sanskrit than to any of the Iranian dialects that later constituted the western wing of the Indo-Iranian family. Thus among the deities Nasatya is the Sanskrit form as opposed to the Zend Naonhaitya and all the four gods are prominent in the oldest Veda, while in the Iranian Avesta they have been degraded to secondary rank (Mithra), converted into demons (Indra) or renamed (Varuna =Ahura Mazda). The numerals are distinctively Indic not Iranian ; aika is identical with the Sanskrit eka while ' one ’ in Zend is aeva. So the s is preserved in Satta where it becomes h in Iranian (hapta) and the exact form is found, not indeed in Sanskrit, but in the Prakrits which were supposed to be post-Vedic. Even the personal names look Indic rather than Iranian. Thus Biridaswa has been plausibly compared with the Sanskrit Brhadasva (owning a great horse). If this be right the second element, asva, horse, is in contrast to the Iranian form aspa seen in Old Persian and Zend. ... Finally we know that there existed among the Mitanni at this time a class of warriors styled maryanni which has suggested comparison with the Sanskrit marya young men, heroes.