It is narrated on the authority of Yahya b. Ya'mur that the first man who discussed qadr (Divine Decree) in Basra was Ma'bad al-Juhani. I along with Humaid b. 'Abdur-Rahman Himyari set out for pilgrimage or for 'Umrah and said:



Should it so happen that we come into contact with one of the Companions of the Messenger of Allah (ﷺ) we shall ask him about what is talked about
taqdir (Divine Decree). Accidentally we came across Abdullah ibn Umar ibn al-Khattab, while he was entering the mosque. My companion and I surrounded him. One of us (stood) on his right and the other stood on his left. I expected that my companion would authorize me to speak. I therefore said: Abu Abdur Rahman! There have appeared some people in our land who recite the Qur'an and pursue knowledge. And then after talking about their affairs, added: They (such people) claim that there is no such thing as Divine Decree and events are...