The research aims to clarify the methodology of Imam al-Nasir li-Din Allah al-Hasan al-Mu’ayyad in his interpretation of the narrations in his book, The Certain Testament, an Interpretation of the Glorious Qur’an. The researcher divided the research into an introduction and five sections. The first topic: Interpretation of the Qur’an according to the Qur’an. The second topic: Interpretation of the Qur’an according to the Sunnah. The third topic: Interpretation of the Qur’an according to the sayings of the Companions and Followers. The introduction included the reasons, the importance of the research, the importance of the research, the research plan, and a conclusion consisting of the results and recommendations. Among the most important results: 1- Imam Al-Muaydi paid great attention to interpreting the hadiths, as he is one of those who belong to this approach. Important in interpretation. 2 - He used to explain the Qur’an with the Qur’an, but did not attribute the verses he interpreted to their surahs. When he mentioned sayings, he attributed some of them to the Companions and Followers, but most of the sayings he did not attribute to them. He used to mention some verses supporting the sayings to support the interpretation, but he did not mention all the supporting verses, and he was satisfied with one verse in many cases. Often.