Satan's Mastery Over Them...
Abu ad-Darda (May Allah be pleased with him) reported that he heard the Prophet (peace and blessings be upon him) said:
"If three people do not make the Adhan (call to Prayer) and establish the Prayer among themselves, Satan gains mastery over them."
[Related by Imam Ahmad]
Something to Think about:
In another similar narration the Prophet (peace be upon him) continued: "....So cling to the Jama'ah (congregation), for indeed the wolf devours a lonely sheep only" (related by Ahmad and Abu Dawood). Very often Muslims neglect such thought-provoking reminders of the Prophet (pbuh), and then bear the consequences of neglecting them without even realizing it. In these Hadiths the Prophet (pbuh) is warning us (men in particular) against missing the daily prayers in congregation.
Remember, Satan stays away from those who gather in Masjid regularly, because it is these congregations and Masjids that are the foundations of Muslim communities. It is the place where Muslims get to know and love one another for Allah's sake. We can already feel these powerful bonds of love, joy, and mercy when we visit the mosques for Taraweeh Prayers in Ramadan. Without these bonds of brotherhood or sisterhood, real Iman (faith) cannot be achieved. In fact, the failure to attend the Masjid eventually makes us a target of Satan, who attacks our faith when we are lonely, just as a wolf attacks a lonely sheep. Consequently, Satan moves our hearts away from Allah, and makes us passive Muslims, disconnected with the affairs and pains of our community members. Indeed, today perhaps one major factor contributing to the disintegration of our family system in the West is due to our loose connection with the Masjid