"When the sovereignty came to Yazdgird, he reigned twenty years; then the Arabs entered Iran in great numbers. Yazd-gird did not contend with them in battle. He went to Khurasan and Turkestan and asked for the assistance of horses and men. They killed him there. Yazdgird's son went to India and brought an army and troops. He was slain before coming to Khurasan. The army and troops were destroyed and Iran remained with the Arabs. They promul- gated their own laws of irreligion, dissolved the bonds of the institutions of the men of old and weakened the Mazdaean religion. They brought into use the washing, burying and eating of polluted matter. From the beginning of creation till this day no evil more grievous than this has come, since by reason of their evil deeds distress and desolation and lamentation have made their abode [in Iran]. By reason of their wicked laws and wicked faith, [there is] pestilence and want and other evils. It is stated in the Religion that there shall come an end of their accursed rule."
January 1, 1970
https://en.wikiquote.org/wiki/Muslim_conquest_of_Persia