question #1 Sahih Muslim Introduction 51, Introduction, Narration 50 : Why is it important to be cautious about the sources of religious stories and teachings?

‘We would catch up with Abū Abd ar-Rahman as-Sulamī and at the time we were young men, so he would say to us: ‘Do not sit with story-tellers other than Abūl-Ahwas and beware of Shaqīq [Abū Abd ar-Rahīm]’. [Muslim] said: ‘This Shaqīq held the view of the Khawārij and is not Abū Wā’il [Shaqīq bin Salamah, the righteous Tabi’ī]’.