(Quoted from Reference: http://www.irf.net/)
Prophet Muhammad (PBUH) in Zend Avesta:
It is mentioned in Zend Avesta Farvardin Yasht chapter 28 verse 129 (Sacred Books of the East, volume 23, Zend Avesta Part II pg. 220):
"Whose name will be the Victorious, Soeshyant and whose name will be Astvat-ereta. He will be Soeshyant (The Beneficent one) because he will benefit the whole bodily world. He will be Astvat-ereta (he who makes the people, bodily creatures rise up) because as a bodily creature and as a living being he will stand against the destruction of the bodily (being) creatures to withstand the drug of the two footed brood, to withstand the evil done by the faithful (idolaters and the like and the errors of the Mazdaynians)".
This Prophecy applies to no other person more perfectly than it does to Muhammad (PBUH):
The Prophet was not only victorious at Fatah Makkah but was also merciful when he let go the blood thirsty opponents by saying: "There shall be no reproof against you this day".
Soeshyant means the ‘praised one’ (refer Haisting’s Encyclopedia), which translated in Arabic means Muhammad (PBUH).