Numan bin Bashir reported,

I heard the Messenger of Allah ﷺ say, and whenever I heard someone say "I heard the Messenger of Allah ﷺ," I would listen attentively and draw near, fearing that I might not hear anyone again say "I heard the Messenger of Allah ﷺ." He said, "What is lawful is clear and what is unlawful is clear, and between them are doubtful matters. Whoever leaves what seems doubtful to him out of fear of sin will be even more inclined to leave what is clearly sinful. Whoever ventures boldly into what he doubts is on the verge of falling into the unlawful. Every king has a sanctuary, and the sanctuary of Allah on earth is His acts of disobedience," or he said, "His prohibitions."

حدثنا سفيان قال حفظته من أبي فروة أولا ثم من مجالد سمعه من الشعبي يقول سمعت

النعمان بن بشير يقول

سمعت رسول الله ﷺ وكنت إذا سمعته يقول سمعت رسول الله ﷺ أصغيت وتقربت وخشيت أن لا أسمع أحدا يقول سمعت رسول الله ﷺ يقول حلال بين وحرام بين وشبهات بين ذلك من ترك ما اشتبه عليه من الإثم كان لما استبان له أترك ومن اجترأ على ما شك فيه أوشك أن يواقع الحرام وإن لكل ملك حمى وإن حمى الله في الأرض معاصيه أو قال محارمه