The Messenger of Allah ﷺ said, "Two or more constitute a congregation."
حدثنا هشام بن عمار حدثنا الربيع بن بدر عن أبيه عن جده عمرو بن جراد
قال رسول الله ﷺ اثنان فما فوقهما جماعة
No references are available.
Its isnad is very daif.Bayhaqi 3/69 narrated it from the hadith of Rabi bin Badr with this chain. See hadith 269 for its defect, and it contains other defects as well. Busiri said, This is a daif isnad.