Abu Tha‘labah al-Khushani (may Allah be pleased with him) reported: Whenever the people encamped during a journey, they would disperse in the mountain passes and valleys. When the Messenger of Allah (may Allah's peace and blessings be upon him) noticed this he said: "Your scattering about in the mountain passes and valleys is indeed from the devil." After that they kept close together whenever they set up camp. Authentic hadith - Narrated by Abu Daoud