Then know that he is Abu Jahl
Imaam adh-Dhahabee (rahimahullaah) said:
وقال الذهبي رحمه الله تعالى :
“إذا رأيت المتكلم المبتدع يقول: دعنا من الكتاب والأحاديث، وهات (العقل) ، فاعلم أنه أبو جهل، وإذا رأيت السالك التوحيدي يقول: دعنا من النقل ومن العقل، وهات الذوق والوجد، فاعلم أنه إبليس قد ظهر بصورة بشر، أو قد حل فيه، إن جبنت منه فاهرب، وإلا، فاصرعه، وابرك على صدره، واقرأ عليه آية الكرسي، واخنقه”
“If you see the innovative mutakallim  saying: ‘Leave out the Qur’aan and Sunnah and bring forth Logic’, then know that he is Aboo Jahl.
And if you see the ‘One on the Spiritual Path’, [who claims that by practising a set of prescribed forms of innovated worship he will attain oneness with Allaah] (i.e., the Soofees) saying: ‘Leave us from [knowledge] that is transmitted (i.e. the Qur’aan and Sunnah) and bring forth the ‘Taste and Ecstasy of Passion’ , then know that he is Iblees (Shaylaan) become manifest in a human form, or has become incarnate within him; so if you become cowardly then run away from him, otherwise wrestle him down, and sit on his chest with your knee, and read ‘Aayatul Kursee,  and strangle him.
[Source: as-Siyar, (4/472)]
 A person who indulges himself in ‘Ilm al-Kalaam or rhetorical speech.
 These are terms used by the Soofees. As for ‘taste’ it means to practice worship by way of practising according to their taste, i.e. their desires. As for ‘ecstasy of passion’ it means in Soofees terminology a level of [spiritual] intoxication with the love of Allaah that a person reaches through their innovated practices.
 Verse 255 from Soorah al-Baqarah (2), and the reason he said this is because this verse is the most severe upon the Shaytaan as in the hadeeth of Aboo Hurayrah (radhiAllaahu ‘anhu) in Saheeh al-Bukhaaree.