In the books actually written by these original jurists and scholars, there are very few theological and judicial differences between them. Imam Ahmad rejected the writing down and codifying of the religious rulings he gave. They knew that they might have fallen into error in some of their judgements and stated this clearly. They never introduced their rulings by saying, "Here, this judgement is the judgement of God and His prophet." There is also very little text actually written down by Jafar al-Sadiq himself. They all give priority to the Qur'an and the Hadith (the practice of Muhammad). They felt that the Quran and the Hadith, the example of Muhammad provided people with almost everything they needed. "This day I have perfected for you your religion and completed My favor upon you and have approved for you Islam as religion" Quran 5:3.