The first:Its opposition to the religion.
The second:Its repulsion of what Allah sent his Messenger (peace be upon him) with.
The third:That the one involved in it does not repent nor reverse from it.
The fourth:That the one involved in it invites people to it.
The fifth:That it consists of speaking about Allah without knowledge.
The sixth:Its opposition to the explicit Sunnah.
The seventh:Its opposition to Ahlus-Sunnah.
The eighth:Striving hard to putting out the light of the Sunnah.
The ninth:Placing in authority those whom Allah and His Messenger (peace be upon him) have deposed of.
The tenth:Deposing of those whom Allah and His Messenger (peace be upon him) have placed in authority.
The eleventh:Giving consideration to what Allah and His Messenger (peace be upon him) have rejected.
The twelfth:Rejecting what Allah and His Messenger (peace be upon him) have given consideration to.
The thirteenth:Allying with those whom Allah and His Messenger (peace be upon him) have enmity for.
The fourteenth:Having enmity for those whom Allah and His Messenger (peace be upon him) have allied with.
The fifteenth:Affirming what Allah and His Messenger (peace be upon him) have negated.
The sixteenth:Negating what Allah and His Messenger (peace be upon him) have affirmed.
The seventeenth:Belying the truthful.
The eighteenth:Believing in the liars.
The nineteenth:Objection of the truth with falsehood.
The twentieth:Overturning the truth by making the truth falsehood and falsehood truth.
The twenty-first:Deviation in the religion of Allah.
The twenty-second:Blinding the truth from the hearts.
The twenty-third:Seeking to make crooked the Straight Path of Allah.
The twenty-fourth:Opening the door for changing the religion in one go.
[Madarij al-Salikin, Ibn al-Qayyim (1/223)]
بضع وعشرون مفسدة للبدع