Book 039, Number 6754: (Muslim)
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) in order 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.


Book 039, Number 6755(Muslim)

Jabir reported that Allah's Messenger (may peace be upon him) said: Iblis places his throne upon water; he then sends detachments (for creating dissension) ; the nearer to him in rank are those who are most notorious in creating dissension. One of them comes and says: I did so and so. And he says: You have done nothing. Then one amongst them comes and says: I did not spare so and so until I sowed the seed of discord between a husband and a wife. The Satan goes near him and says: 'You have done well’. A'mash said: He then embraces him