The Prophet of Allah ﷺ prayed Dhuhr with five units. The people asked, "Has the prayer been increased?" So he performed two prostrations.
حدثنا محمد بن جعفر حدثنا شعبة عن جابر عن عبد الرحمن بن الأسود عن أبيه
صلى نبي الله ﷺ الظهر خمسا فقالوا أزيد في الصلاة فسجد سجدتين
Its isnad is daif, due to the weakness of Jabir Jafi. It is an abridgment of 4072. Its meaning has already been mentioned with sahih chains of transmission many times, the last of them being 4282, 4358.