The phenomenon of "silence" in mythical, religious, and mystical traditions is understood not merely as linguistic passivity or the sheer absence of speech, but as a foundational structure in the constitution of the experience of the sacred and negative epistemology. This study aims to explicate the becoming (sayrurat) of the concept of silence in Iranian culture, exploring the phenomenological evolution of this signifier from the realm of myth to the spheres of epic and mysticism. Adopting a phenomenological, hermeneutic, and comparative approach, this research analyzes the manifestations of ritual and epistemic silence in Avestan and Pahlavi texts, Ferdowsi's Shahnameh, the Masnavi, and Mantiq al-Tayr, juxtaposing them with the esoteric traditions of the Far East (Zen, Taoism, and the Upanishads). The findings demonstrate that silence in the Iranian tradition functions as an "ontological pattern" and a condition of possibility for the manifestation of the numinous, evolving through three successive layers: first, a ritual-purificatory function in the Zoroastrian tradition; second, an existential-tragic function in the Shahnameh in confronting destiny; and third, an intuitive-epistemic function in Islamic mysticism as a phenomenon of annihilation (fana). In the comparative horizon, Eastern silence is oriented toward the absolute emptiness of the subject, whereas silence in Iranian mysticism is a realm replete with ecstasy, divine love, and sacred presence. Ultimately, this becoming reflects the progressive internalization of spiritual experience in Iranian history, transforming silence from a ritualistic act into an authentic mode of "Being-in-the-world."