 Khaliil ibnu Axmad 100-170H oo ahaa caalimkii qoray qaamuuskii ugu horreeyey ee af Carabi ah, ahaana macallinkii Siibawayhi naxwaha baray, ayaa yidhi Qofna cilmiga naxwaha kama gaadho inta uu rabo ilaa uu barto wax uusan rabin. 