'Verily the Shaytaan is the enemy of a man just as the wolf is (the enemy) of a flock. He seizes the solitary sheep going astray from the flock or going aside from the flock. So avoid the branching paths; it is essential for you to remain along with the (righteous) community.'
The above quotation was said by Prophet Muhammad (Peace and blessings be upon him) Al-Tirmidhi Hadith 184 Narrated by Mu'adh ibn Jabal