Nowruz traditional ritual, as a cultural living heritage, is combined with the religious beliefs and becomes one of the factors linking national and religious identity of the Iranians. Thus, investigating the narratives and jurisprudential resources of nowruz as the largest national festival of ancient Iran, is very important. Since the basis of all the sources of tradition and jurisprudence on Nowruz is that of Mu’lla Ibn Khnys’s, quoted from Imam Sadiq, in this paper, a brief reference is made to the evolution of the Nowruz and using a descriptive-analytical method, the researcher tried to verify Mu’lla’s narrative. The results indicated that Mu’lla’s narrative about Nowruz is not acceptable.  Since this version of narrative does not conform to the historical events. Moreover, in the first versions of Sheikh Tusi’s Misbah Al-mojtahed, the first reliable work used by the past sources, there is not such a narrative and it has been added in the subsequent versions.