Harshen Larabci yana da Istilaah (al'ada ko yarjejeniya) wadda Larabawa suka yi yarjejeniya a kanta, don haka suka kafa tare da tsara takamammun Alfaazh (kalmomi) domin nuna takamammun ma'anoni.

The Arabic Language is an Istilaah (convention) that the Arabs made a convention (i.e. agreement) upon and so they placed down and set specific Alfaazh (wordings) to indicate specific meanings.

Hanyar da muke ɗaukar harshen Larabci ita ce ta hanyar ruwaya sahihiya (Riwaayah). Saboda haka, lafzi (kalma) ana ɗaukarsa Larabci idan an karɓo shi daga Larabawa ta hanyar ruwaya sahihiya, wato ko dai Naql Al-Mutawaatir (karɓa mai yawa wadda ba za a iya yin ƙarya a kanta ba) ko kuma Khabar Al-Aahaad (ruwayoyin mutum ɗaya). Larabawan da harshensu ake dogara da shi a matsayin hujja ko shaida, su ne Aqhaah (Larabawa masu tsantsar harshe) waɗanda suke magana da harshen Larabci kafin a lalata harshen Larabci. Wani rukuni ko sashe daga cikinsu ya ci gaba da kasancewa har zuwa karni na huɗu bayan Hijira, kuma waɗannan su ne waɗanda suke rayuwa irin ta Badawiyya, harshensu bai lalace ba saboda rashin haɗuwa da sauran al'ummomi irin su Romawa da Farisawa (galibi a cikin birane da garuruwa).