Allah Exposes Those Who Feign Adherence to the Truth – Shaykh Abdus Salaam Burjis
Today there are many who ascribe to the Sunnah and adorn themselves with the clothing of the people of Sunnah, so much so that it is not possible (for many) to distinguish between the true people of Sunnah and other than them in an easy manner, and those who wear the garbs of Sunnah and pretend to adhere to the Sunnah do not do so except in order to destroy the unity of Ahlus Sunnah wal Jamaa’ah, attempting to split their ranks, and pitting them against one another. All of this in order to raise the banner of innovation and so that it’s armies prevail, however:
يَمْكُرُونَ وَيَمْكُرُ اللَّهُ ۖ وَاللَّهُ خَيْرُ الْمَاكِرِين
they were plotting and Allah too was planning, and Allah is the Best of the planners. (Al-Anfaal: 30)
Therefore, no matter how much someone infiltrates or hides among the People of Sunnah and no matter how deceptively he puts on their garbs, Allah will tear his cover away and expose his affair, a person does not hide (amongst the people of Sunnah), except that Allah, Glory be to Him, the Most High, brings his hidden affair out through slips of the tongue and expressions of the face.
Al-Rad Al-’Ilmi ‘ala Munkari at-Tasnif pg.22