Ali al-Ridha
When Ali al-Ridha was entering Neyshabour a large crowd had gathered outside the city and some of the great scholars such as Muhammad ibn al-Rafi, Ahmad ibn al-Harith, Ishaq ibn al-Rahuwayh, and Yahya ibn al-Yahya were accompanying him. Twenty (or ten or thirty) thousands have reported the event. The narrations mentioning "twenty thousands" reporters are more famous. Many sunni laymen and scholars participated in welcoming the Imam. Scholars asked Ali al-Ridha to narrate hadith for them. So Ali al-Ridha announced al-Silsilah al-Dhahab.