Classical Arabic
Case

The A1 inscription dated to the 3rd or 4th century AD in the Greek alphabet in a dialect showing affinities to that of the Safaitic inscriptions shows that short final high vowels had been lost in at least some dialects of Old Arabic at that time, obliterating the distinction between nominative and genitive case in the singular, leaving the accusative the only marked case:

Classical Arabic however, shows a far more archaic system, essentially identical with that of Proto-Arabic:
punctuation:no_comma, language:response_language[Dutch]