Rudaki Samarqandi, a prominent poet and musician of the Samani court, is one of the first literati of the Islamic era, who paid special attention to sermon and the inclusion of wise opinions in the form of poetry in his works, and the correctness of this matter is clearly visible despite the few couplets left by him. In this regard, the present research tries to show, firstly, the influence of some advices and ideas left in Pahlavi and Mazdayasna literature by taking an intertextual look at Rudaki's poems and using the descriptive method and library studies. Then, by bringing sufficient evidence and examples, the adaptation of some Iranian poets and writers after Rudaki to the 7^th century AH (relying on the advices of Ferdowsi, Asadi Toosi, Nasir Khosrow, Nizami Ganjei and Sa`di) from those advices should be shown. In fact, this essay, more than anything else, aims to show the mediating role of Rudaki among pre- and Islamic Iranian advisers in the expression of certain didactic themes and teachings. Among its most important findings, we can mention the significant frequency of Rudaki's tendency towards the subject of the cosmos and its related concepts; a topic that has been significantly reflected in the literary works after him, especially in Ferdowsi's Shahnameh. And it seems that its main source should be sought in the spiritual heritage of the past and Pahlavi advice books.