Hawzah News Agency – The merciful prophet of Islam (pbuh) says:

يدُ اللَّهِ على‏ الجَماعةِ، فإذا اشْتَذَّالشّاذُّ مِنهُم اخْتَطَفَهُ الشّيطانُ كما يَخْتَطِفُ الذِّئبُ الشّاةَ الشّاذّةَ مِن الغَنَمِ.

'Allah's Hand [i.e. divine aid] is with the congregation. Whenever a straying individual deviates, Satan snatches him up like a wolf snatches a sheep straying from the herd.'

Source: Kanz al-Ummal, no. 1032