The term “Bayan” (expression) means speech, utterance, or the act of making something clear and apparent. Although "Bayan" is often associated with freedom, this study treats it as a subject of inquiry, seeking to determine whether it is a fundamental human right or a social obligation. Undoubtedly, choosing either perspective has implications that must be examined. Given the necessity of grounding any discussion on this issue in religious teachings, the primary question this study seeks to answer is: How do different religions view the concept of expression? Based on this, the perspectives of Allamah Jafari and Ayatollah Khamenei are compared. The outcome of research into religious sources reveals that "Bayan," in its essence, is subject to the ruling of permissibility (Ibaha) and is thus considered a fundamental right. Consequently, the Islamic Legislator has established a framework for it, which includes not infringing on the rights of others—whether personal or public—and avoiding the commission of divine prohibitions. At the same time, there is strong evidence supporting the necessity of employing "Bayan," making it subject to the ruling of obligation (Wujub). Regarding the comparison between the views of Allamah Jafari and Ayatollah Khamenei, it was concluded that both thinkers, influenced by religious principles, not only consider expression a right but also, in certain cases, deem it obligatory. Both perspectives—whether as a right or an obligation—must align with spiritual growth and elevation, or what can be termed "rational life" (Hayat-e Maqool). A notable feature in the statements of Ayatollah Khamenei is that he not only addresses the topic based on the needs of the public sphere in Islamic society but also demonstrates, through his practical conduct, a commitment to the obligation of expression in appropriate contexts.