Because of the weakness of the Umayyads at the time of Imam al-Sadiq (a), the Imam was relatively free to teach and engage in scholarly activities. This religious and scholarly freedom rarely happened during the time of the other Imams, and thus most of our hadiths are from Imam al-Sadiq (a). According to Ibn Hajar al-Haytami, people learned and transmitted a great deal of knowledge from him, and his fame reached far and wide. Al-Jahiz also wrote that "his knowledge and jurisprudence have filled the world." Al-Hasan b. 'Ali al-Washsha' reports that he saw nine-hundred people in the mosque of Kufa transmitting hadiths from Imam al-Sadiq (a).