**Features of the Commentary "Al-Kashf wal Bayan" (The Unveiling and Clarification):**

This commentary possesses remarkable characteristics that have earned it high praise from scholars who have benefited greatly from it. Among its most significant features are:

1. **Quranic Exegesis with Quran:**
   The commentary excels in interpreting the Quran using the Quran itself, considered one of the most effective methods for explaining the words of Allah.

2. **Integration of Hadith and Sunnah:**
   It relies on the interpretation of the Quran through the guidance of the Prophet Muhammad's (peace and blessings be upon him) authentic traditions, which serve as a clear explanation and elucidation of the Quran.

3. **Incorporation of Companion and Successor Opinions:**
   The commentary includes a substantial number of statements from the Companions (may Allah be pleased with them) who had a profound understanding of the Quran after the Prophet Muhammad (peace be upon him). Additionally, it incorporates the opinions of the Successors who learned the interpretation directly from the Companions.

4. **Abundance of Narrations:**
   Al-Tha'labi's commentary is rich with narrations, including sayings of the Companions, Successors, and subsequent scholars. It even includes some poetic evidence, a unique feature not commonly found in other commentaries.

5. **Extensive Coverage of Quranic Readings:**
   The commentary encompasses a large number of Quranic readings, a feature not widely found in other interpretations. Many later scholars have relied on it for this reason.

6. **Narration with Isnad (Chain of Transmission):**
   "Al-Kashf wal Bayan" is distinctive as one of the few commentaries that narrates with a chain of transmission. It not only narrates hadiths but also reports the statements of Companions, Successors, and even some later scholars, all with its unique chain of transmission.

7. **Reference for Reasons of Revelation (Asbab al-Nuzul):**
   It serves as an important reference for the reasons behind the revelation of verses, incorporating a vast number of narrations in this regard. Many subsequent scholars, including Al-Wahidi and Ibn Hajar, have relied on it.

8. **Inclusion of Quranic Sciences:**
   The book covers a wide range of Quranic sciences, contributing to a comprehensive understanding of the Quran.

9. **Emphasis on Arabic Language:**
   The commentary extensively uses the Arabic language in all its sciences, including grammar, morphology, rhetoric, literature, and poetry. It quotes linguistic scholars and addresses linguistic issues, incorporating a substantial amount of poetic evidence.

10. **Treatment of Jurisprudential Issues:**
    The author addresses and conveys the opinions and evidence of jurists regarding legal issues.

11. **Preservation of Lost Works:**
    An important feature is its preservation of many lost books, confirming their attribution and transmitting them with an isnad to their authors. This makes the commentary a source for documenting these works.

12. **Integration of Narration and Understanding:**
    It combines narration and understanding in interpretation and harmonizes between interpreting based on transmitted reports and interpreting based on reasoning.

13. **Author's Style and Organization:**
    The author's excellent style and organized presentation of issues, statements, readings, and more contribute to the readability and coherence of the commentary.

14. **Abundance and Diversity of Sources:**
    The book draws from numerous sources, contributing significantly to the enrichment of its scholarly content.

15. **Precedence and Influence:**
    "Al-Kashf wal Bayan" holds a prominent position among other commentaries, and many scholars who came later have relied on it. Its influence extends across centuries, confirming its authenticity and distinctiveness.