عن مجاهد قال كان عمر يرى الرأي فينزل به القرآن
الإتقان في علوم القران للسيوطي
Mujahid said: “Umar would express an opinion, and Quran would be sent down based on that.”
Excellence in the Quranic Sciences [Al-itqan fi Ulum Al-Quran] by Al-Suyuti