The Prophet has said...

The Prophet has said, that when you see an oppressive ruler legitimizing that which has been prohibited by Allah and breaking His covenant, and opposing the cus­toms of the Prophet, and he behaves unjustly and oppressively with Allah’s servants, then if a person does not oppose him through his word or deed, it is incumbent upon Allah to place that person on the status of that oppres­sor.

Beware that these statesmen (of Bani Umayyah) have adhered to the commands of Shaitan and disobeyed the orders of Allah, and have made corruption the custom of the day. They have gathered the rights at one place and have reserved the treasury of Muslims (Baytul Mal) for them­selves, and permitted the prohibitions of Allah and forbade that which is allowed by Him. I am more worthy among all the men to stop and oppose them.

You sent your letters to me, and your messengers too, saying that you have taken the oath of fealthy to me and promised that…