He heard the Messenger of Allah ﷺ say, "The congregational prayer surpasses the prayer performed alone by twenty-five degrees."
حدثنا أحمد بن الحجاج أخبرنا عبد العزيز بن أبي حازم حدثنا يزيد بن عبد الله بن الهاد عن عبد الله بن خباب
أنه سمع رسول الله ﷺ يقول صلاة الجماعة تفضل صلاة الفذ بخمس وعشرين درجة
Its isnad is sahih. Ahmad bin Hajjaj Marwazi is trustworthy, Abdul-Aziz bin Abu Hazim is a jurist of established reliability, Ibn Hadi's name is Abdullah bin Yazid bin Usama bin Hadi, and Abdullah bin Khabab Ansari is trustworthy. The hadith has already appeared at 11459.