Reference: Kitaabul-‘Ilm – p106
Shaykh Ibn ‘Uthaymeen said:
And sadly, now you find some of the brothers refuting their brothers more than they refute the atheists – whose disbelief is apparent.
And they are hostile towards them more than these [atheists and their like].
And they make public their speech [against their brothers] – of which there is no basis nor truth, just jealousy and hatred.