عن الشعبي قال لما قدم عدي بن حاتم الكوفة أتيناه في نفر من فقهاء أهل الكوفة فقلنا له حدّثنا ما سمعت من رسول الله ﷺ فقال أتيتُ النبي ﷺ فقال يا عدي بن حاتم أسلم تسلم قلت وما الإسلام فقال تشهد أن لا إله إلا الله وإني رسول الله وتؤمن بالأقدار كلها خيرها وشرها حلوها ومرها
سنن إبن ماجه كتاب المقدمة
From Al-Sha’bi who said: When ‘Adi ibn Hatim came to Kufa, we went to see him with a group of the legal scholars of Kufa and said to him: Tell us about what you heard from the Messenger of Allah (SAW). And he said: I went to the Prophet (SAW) and He said: Oh ‘Adi ibn Hatim, yield into Islam and be safe. I said: And what is Islam? He said: You bear witness that there is no god but Allah and that I am the Messenger of Allah; and you believe in everything that is preordained – the good and bad of it, the sweet and bitter of it.
Sunan Ibn Majah, The book of introduction