Abdullah bin Umar reported,
I heard the Messenger of Allah ﷺ say, "Discord comes from over there," and he gestured with his hand toward the east, "from where the two horns of Satan rise, while you strike one another's necks. Musa killed the man he killed from the people of Pharaoh by mistake, yet Allah 
said to him, "And you killed a soul, so We rescued you from distress and tried you with a severe trial" [Taha 20:40].
Azami 15841
Sahihعن عبد الله بن عمر يقول
سمعت رسول الله ﷺ يقول: إن الفتنة تجئ من ههنا، وأومأ بيده نحو المشرق، من حيث يطلع قرنا الشيطان، وأنتم يضرب بعضكم رقاب بعض، وإنما قتل موسى الذي قتل من آل فرعون خطأ، فقال الله عز وجل له: {وقتلت نفسا فنجينك من الغم وفتنك فتونا} [طه: ٤٠].
Muslim narrated it in the Book of Tribulations and the Signs of the Hour (2905:50) through several routes from Ibn Fudayl, from his father, who said, I heard Salim bin Abdullah bin Umar say, "O people of Iraq, how you ask about the small matter while committing the great one. I heard my father Abdullah bin Umar say," and then he mentioned it.