In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Allaah [The Most High] said: [ أَفَمَن زُيِّنَ لَهُ سُوءُ عَمَلِهِ فَرَآهُ حَسَنًا – Is he, then, to whom the evil of his deeds made fair seeming, so that he considers it as good (equal to one who is rightly guided)?] [Surah Faatir; Ayah 8] Sa’eed Bin Jubair [rahimahullaah] said, “This was revealed concerning the people of bidah and desires”. [Tafseer Al-Baghawi 3/689]
Shaikhul Islaam Ibn Taymiyyah [rahimahullaah] said: The Salaf named Ahlul Bidah Wal Furqah [i.e the people of Bidah and Splitting]- those who oppose the Book and the Sunnah- ahlul ahwaa [the people of desires], because of the fact that they accept what they love and reject what they hate based on their desires without guidance from Allaah. [Source: An Excerpt from Majmoo Al-Fataawaa 4/189-190]
After this vile and confused youth was refuted with proofs that are as clear as the midday sun, he persisted upon his bidah and continues unleashing the filth of his tongue by way of slander against Ahlus Sunnah. The Prophet [sallal laahu alayhi wasallam] said, “Whoever accuses a believer of something that is not true, Allaah will make him dwell in flowing pus on the Day of Judgement”. [Saheeh Al-Jaam 6196]