"The punishment of those who wage war against Allah and His Messenger, and strive with might and main for mischief through the land is: execution, or crucifixion, or the cutting off of hands and feet from opposite sides, or exile from the land: that is their disgrace in this world, and a heavy punishment is theirs in the Hereafter;" - Quran 5:33 (read more)

"Narrated Anas bin Malik: Allah's Apostle said, "You should listen to and obey, your ruler even if he was an Ethiopian (black) slave whose head looks like a raisin." - Sahih Bukhari 9:89:256 (read more)

"If war is waged anywhere to achieve this goal, namely to free the occupied lands of the laws and the tyranny of disbelievers, it is undoubtedly a case of Jihad for the sake of Allah. It thus needs to be financed from the money of Zakah, the amount of which is to be decided based on the total sum of the charity, the requirements of Jihad as well as the degree of the need of other potential recipients of charity." - Yusuf al-Qaradawi