Commentators have presented different views in interpreting the initial verses of Surah Ar-Rahman, especially the word “bayan” in verse 4 of this Surah. Most commentators have interpreted this word as speech, speaking, understanding, and understanding. In this study, which was conducted using a descriptive-analytical method and library resources; by examining the chain of transmission and jurisprudence of hadith, another meaning of the word “bayan” in this Surah has been presented. The aforementioned narration has been narrated in two ways in the books Basa’ir al-Darajat and Tafsir al-Qummi and has been reflected in Shia hadith and exegetical sources. The results of the study are that, although commentators have interpreted the meaning of the word “bayan” in verse 4 of Surah Ar-Rahman to mean topics such as: speech, speech, understanding, understanding, oratory, etc. However, since the Quran is multifaceted and its words can bear multiple meanings, another meaning can be attributed to it by citing the narration of Imam Reza (AS); This meaning is the interpretation of the verse, not its commentary. Based on the content of this narration, the word “al-Bayyan” refers to a collection of revelations that, like the Holy Quran, were revealed by God to the Holy Prophet (PBUH), and the Prophet (PBUH) taught all of that content to the Commander of the Faithful (PBUH). This meaning is mentioned more clearly in verse 19 of Surah al-Qiyamah: “Then indeed, upon us is its explanation.” Other narrations from Imam Ali (PBUH) and the pure Imams (PBUH) also confirm this meaning.