He said, "There is no surah from the Mufassal section, whether short or long, except that I have heard the Messenger of Allah ﷺ lead the people in the obligatory prayer with it."
حدثنا أحمد بن سعيد السرخسي حدثنا وهب بن جرير حدثنا أبي قال سمعت محمد بن إسحق يحدث
أنه قال ما من المفصل سورة صغيرة ولا كبيرة إلا وقد سمعت رسول الله ﷺ يؤم الناس بها في الصلاة المكتوبة
No references are available.
[Its chain is daif] Bayhaqi transmitted it: 2/388, from the hadith of Wahb bin Jareer, through this chain. Muhammad bin Ishaq is a mudallis, as mentioned previously at 313, and I did not find an explicit statement that he heard it directly.