The Besht did not want to show the [manuscript of the] Zoref to anyone because he did not want anyone to read it before he completed his annotations. He only showed it to the Koretzer three times. 

Hasidim say that he [the Besht] wrote the final marginal note the last week before Shevu’ot the year he passed away.

 

I.F.

Pinchas Landau