Among the prevalent doubts is the assertion that Salman the Persian's presence alongside the Prophet played a fundamental role in the formation of the Quran and the instruction of the Prophet. This research, employing a descriptive-analytical methodology, seeks to address this doubt. The findings demonstrate that this allegation is not only unsubstantiated, but also that similarities among various religions can be attributed to their common origin—divine revelation. Furthermore, if the Prophet had acquired the Quranic phraseology from Salman, the linguistic uniformity, eloquence, and rhetorical excellence of the Quranic verses refute this assertion, as Salman's language was neither Arabic nor eloquent. If the contention suggests that the Prophet derived the content from Salman, the conceptual coherence and the transcendence of Quranic teachings compared to those in other scriptures and religions negate any notion of the Prophet's susceptibility to external influence. Additionally, Salman converted to Islam in Medina, whereas the majority of the Quran was revealed in Mecca. Ignorance or deliberate prejudice can also be identified as factors behind such doubts. Moreover, Salman's familiarity with the Torah, Gospel, and Avesta—texts subject to distortions and numerous contradictions—cannot substantiate him functioning as the Prophet's instructor in producing the miraculous Quran with its profound doctrinal content.