Commentary for Kiddushin 59:13
בעי רב יוסף והתגלח מהאי גיסא או מהאי גיסא א"ל אביי פסוקי מיהא ליתו לימנוי' בפסוקי נמי לא בקיאינן דכי אתא רב אחא בר אדא אמר במערבא פסקי ליה להאי קרא לתלתא פסוקי (שמות יט, ט) ויאמר ה' אל משה הנה אנכי בא אליך בעב הענן
They did not stir from there until a Scroll of the Torah was brought and they counted them? - They were thoroughly versed in the defective and full readings,<span class="x" onmousemove="('comment',' E.g., the long i and long o are sometimes indicated by a yod and waw respectively; then the reading is called 'full'; sometimes they are omitted; then it is called defective.');"><sup>28</sup></span> but we are not. R'Joseph propounded: Does wehithgalah belong to the first half or the second? Said Abaye to him, For the verses, at least, we can bring [a Scroll] and count them! - In the verses too we are not certain.