معادلة سورة الكافرون بربع القرآن الميمون ، تأليف يوسف شبير أحمد البريطاني
This Arabic treatise critically examines the narrations which suggest that Surah al-Kafirun is equivalent to one quarter of the Quran. The mutiple chains of the narration and the meaning of the narration is discussed in detail.
Is Sūrah al-Kāfirūn equivalent to one quarter of the Qurʾān?
Is there a ḥadīth that states that Sūrah al-Kāfirūn is equivalent to one quarter of the Qurʾān, and if so is it authentic and what does it mean?
The answer to this question has moved to the following: https://islamicportal.co.uk/is-surah-al-kafirun-equivalent-to-one-quarter-of-the-quran/