Sufism
Sufism (tasawwuf) did not appear until after the first three generations which the Messenger of Allaah (peace and blessings of Allaah be upon him) praised when he said, «The best of mankind is my generation, then those who come after them, then those who come after them...» [narrated by al-Bukhaari, 2652; Muslim, 2533; from the hadeeth of Ibn Mas'ood].
Shaykh al-Islam Ibn Taymiyah (may Allaah have mercy on him) said:
"With regard to the word soofiyyah (Sufism), it was not known during the first three generations, rather it became known after that" (Majmoo' al-Fataawa, 11/5).
This tareeqah and its like are among the innovated ways that go against the Qur'aan and Sunnah and the way followed by the best generations. All the shaykhs of these tareeqahs have made up their own words (phrases to be uttered as dhikr), hizb (books of du'aa' to be read daily by their followers) and ways of worship by which each of them may be distinguished from the others; this goes against sharee'ah and divides the ummah.
Read more:
Sufi tareeqahs & ruling on joining them