After the period of the pious Caliphate, corruption set in in the Muslim rulers. Still the religious scholars did not rise in revolt against the rulers, scrupulously avoiding any confrontation. They continued to expend their efforts in non-political fields. This was not simply a matter of chance but the adoption of a policy based on the clear injunctions of the shariah. As we know, books of Hadith record the traditions in detail under chapters like al-Fitan (Trial).