Hadith 1070

Abud-Darda' (May Allah be pleased with him)reported: I heard the Messenger of Allah (PBUH) saying, "If three men in a village or in the desert, make no arrangement for Salat in congregation, Satan must have certainly overcome them. So observe Salat in congregation, for the wolf eats up a solitary sheep that stays far from the flock."

[Abu Dawud].