as Salam Alaykum.
Book: al-Mahasin an-Nafsaniyah fi Ajwibatal Masail Khorasaniyah.
Author: Shaykh Husayn ibn Muhammad al-Usfur al-Bahrani.
“and what is clear (apparent) to us from reports that is disbelief of all opponents and their shirk. And that they are worse than Jews and Christians, and whoever believe that they have portion in Islam is disbeliever (himself)”