(16) بَاب تَحْرِيشِ الشَّيْطَانِ وَبَعْثِهِ سَرَايَاهُ لِفِتْنَةِ النَّاسِ وَأَنَّ مَعَ كُلِّ إِنْسَانٍ قَرِينًا
Jabir reported:
I heard Allah's Messenger (way peace be upon him) as saying: The throne of Iblis is upon the ocean and he sends detachments (to different parts) inorder to put people to trial and the most important figure in his eyes is one who is most notorious in sowing the seed of dissension.
Reference: Sahih Muslim 2813 a
In-book reference: Book 52, Hadith 59
USC-MSA web (English) reference(deprecated numbering scheme): Book 39, Hadith 6754