Second, the Masorah , the specific scholarly discipline of transmitting the correct Bible text had resulted in a finalized form of Hebrew vowels, accents, and cantillation marks. These were apparently written down in the 10th century thus providing Jewish scholars with a monolithic written Bible. This, in turn, enabled the systematic study and analysis of Biblical grammar. It was not an easy task. The most serious problem with Biblical grammar, however, is the structure of the Hebrew verb.
All Hebrew verbs consist of three root letters.
Saadia assumed that Hebrew verbs could have either one, two, or three root letters, and he wrote this in his grammar book. Later generations of Jewish grammarians made the same mistake. The greatest controversy over the structure of the Biblical Hebrew verb took place in the 11th century. It began when Menachem ben Jacob ibn Saruk wrote his biblical dictionary. Dunash ben Labrat wrote a responsum attacking Menachem's dictionary.