is the pronunciation of takfeer [declaring someone a disbeliever] of some of you over others so that they fight each other, as occurred with the Khawaarij when they revolted against the Ahl us-Sunnah wal-Jamaa’ah. And it has been said that the meaning of:

..or to cover you with confusion in party strife [Al-An’aam 6:65]

is "Covering with differences/disunity"

Mujaahid and Abu al-‘Aaliyah said: "This verse is about the Ummah of Muhammad (sallallaahu ‘alaihi wasallam)." Abu al-‘Aaliyah said: "They are four in number, two of them appeared twenty-five years after the death of the Prophet (sallallaahu ‘alaihi wasallam), so they were covered with the confusion of party-strife and some of them were made to taste the violence of others - and two remained and they will occur, for sure: Being swallowed from underneath you (i.e. by the earth) and being transformed/disfigured from above you."

And this, all of it, is very clear in that the differences and desires (i.e. innovations) are disliked and not liked and are blameworthy and not praiseworthy.

And from what has been reported from Mujaahid about the saying of Allaah:

But they will not cease to disagree - except him on whom your Lord has bestowed His Mercy (the follower of truth - Islâmic Monotheism) and for that did He create them. [Hud 11:118-119]

He said about ‘those who disagree’: "They are the People of Falsehood" and about ‘except him on whom your Lord has bestowed His Mercy’: ‘The People of Truth, there is no difference amongst them."

And it has been reported from Mutarrif bin ash-Shakheer that he said: "If the desires had been but one (i.e. united) then a person would have said: ‘Perhaps the truth is in it. But when the desires split and separate [and become many], every possessor of intelligence knows that the truth never splits [contradicting itself]."

From ‘Ikrimah "’But they will not cease to disagree’, meaning in the desires [i.e. their innovations] and ‘except him on whom your Lord has bestowed His Mercy’, they are the Ahl us-Sunnah."

And Abu Bakr bin Thaabit al-Khateeb has quoted from Mansoor bin Abdur-Rahmaan that he said: "We were sitting with al-Hasan and there was a man behind me standing and he began to order me to ask him about the saying of Allaah:

But they will not cease to disagree - except him on whom your Lord has bestowed His Mercy [Hud 11:118-119]

So he said: "Yes, ‘they will not cease to disagree’ upon their different ways ‘except on whom your Lord has bestowed His Mercy’ so whomever He bestows His Mercy upon does not disagree.[i.e. he is not in disagreement as to the truth, he is clear about it.]