This study addressed a new comprehension of inscriptions of a religious building from Bahri Mamluk period called the zawiya al-Adawiyya or zawiya of Shaykh Zayn al-Din Yusuf (al-Qadariya mosque) near Bab al-Qarafa, this monument was built by the members of the Sufism Adawiyya (tariqa الطريقةالعدوية). They are Kurds, supporters the Umayyad dynasty that ruled the Muslim world in the first century of Islam, and they are supporters especially Yazid Ibn Muawiyah, so they are called Yazidis, and also they were enemies of the family of the Prophet and Shiites. The study addressed the reasons of the Yazidi coming to Cairo, and why they built the zawiya of this magnificence. Also, the study amended the historical confusion between two contemporary Yazidi men, both of them had the same name Zayn al-Din Yusuf. One of them, a revolutionary politician with an ambition to rule, and the other a Sufi, the Sufi who came to Cairo and became the head of the Sufi shaykhs. The reason for building the zawiya for them as they was allied with Mamluks, and they were brave and strong, and they fighted alongside Mamluks. The study also addressed the inscriptions of the zawiya, and explained the reasons why Yazidis put the lineage of Sheikh Uday ibn Musafir in a series of descendants Yazid bin Muawiyah and the tribe Quraysh, or rather why they plagiarized his lineage; The study discussed the Yazidi doctrine of Shaykh Uday ibn Musafir, and what are the boundaries of faith in him. Then the study discussed the method of writing Qur'anic verses in the inscriptions by many illustration drawings.