All of the following are among the five pillars of Islam except?

The five pillars of Islam are the declaration of faith (Shahada), prayer (Salah), almsgiving (Zakat), fasting during Ramadan (Sawm), and pilgrimage to Mecca (Hajj). Any concept or practice not related to these five, such as cultural traditions or additional religious practices, would be considered outside the pillars. For example, the belief in angels or prophets is essential in Islam but does not fall under the five pillars.