SHAFAQNA – It is narrated from Imam Hussain (AS) who said: When the Islamic Ummah (nation) is struck with a ruler such as Yazid, must say farewell (goodbye) to Islam . In a letter to some leaders in Basrah (a large city in Iraq), Imam Hussain (AS) explained the aim of uprising against Yazid’s rule: I call upon you (invite you) to the book (the Quran) of Allah (SWT), and the traditions of God’s Prophet (PBUH), because this group (Yazid and his accomplices) has destroyed the traditions of the Prophet (PBUH) . In his will, Imam Hussain (AS) wrote: I have not come out of Medina out of stubbornness, or for pleasure, or corruption, but I have risen for revival of my grandfather’s Ummah, I want to enjoin good and forbid wrong .
 Luhoof, Page 11, and Beharul Anwaar, Vol. 1, page 184.
 Tarikh Tabari, Vol. 4, page 265.
 Maqtal-e-Maqram, Page 156.