During the time of Allamah Hilli, a Sunni scholar had written a book against the Shia faith. This scholar used quotes from his book in all his gatherings and succeeded in creating a dislike for Shiaism amongst the people. He never gave this book to anybody lest it might fall into the hands of the Shia scholars who would write its refutation.
Allamah Hilli began to attend the lectures of this scholar so that he could somehow lay his hands on that book. Gradually he began to call himself the author’s student and concealed his faith.
After sometime, he developed a close affinity with his ‘teacher’. Taking advantage of this proximity, Allamah Hilli asked him for the book and pleaded to such an extent that he could not refuse. So he said, “Okay, I shall lend you this book but not for more than a night.” With not much to choose, he considered it an opportunity better than nothing. He wanted to copy as much as he could while the refutation could be written later. But when it was midnight, Allamah Hilli felt sleepy. At that very moment, a dignified personality entered his room and conversed with him for some time. The gentleman offered to copy the book while Allamah Hilli took some rest. The Allamah accepted this without protest and went to sleep. When he woke up, he found the gentleman missing. On seeing the book, he saw that the whole book had been copied and signed at the bottom,
"The Proof of Allah wrote this.''