[Pooya/Ali Commentary 30:3] This verse was sent to console the grieved Muslims bringing the prophesy that soon the Romans will defeat the Persians. Inter alia, this also meant that the pagans of Makka, who were so happy about the defeat of the Romans, would very soon be disillusioned both about the fate of the Persian fire-worshippers and their own fate against the Muslims. This prophesy of the Quran was fulfilled in 624 A.D. when Heraclius defeated the Persians; and at the battle of Badr (in 2 A.H.) the disbelievers of Makka were defeated by the Muslims. According to Imam Muhammad bin Ali al Baqir, when the Holy Prophet migrated from Makka and arrived in Madina, he sent out two letters, one to the Byzantine emperor and the other to the emperor of Persia, inviting them to embrace Islam. The Muslim envoy received honour in Constantinople and the emperor returned him with valuable gifts despite his not accepting the invitation to join Islam. While the emperor of Persia insulted the Muslim envoy and tore the Prophet's letter into pieces. The Byzantine emperor was rewarded by Allah for the respect he paid to the Holy Prophet' envoy and to the invitation to Islam whereas the Persian emperor met the return for his pride and insulting arrogance with which he rejected the divine invitation. In this way the prophesy that came with the verses of Quran was fulfilled and the Muslims rejoiced at it.