Which of the following is NOT one of the 5 Pillars of Islam?

The five Pillars of Islam are fundamental acts of worship that outline the core beliefs and practices for Muslims. The first pillar is the declaration of faith, believing in one God (Allah) and that Muhammad is His prophet. The second is daily prayer (Salah), which occurs five times a day, helping to cultivate a direct connection with Allah. The third pillar is almsgiving (Zakat), which emphasizes the importance of charity and supporting those in need.

Celebrating festivals, while important in the Islamic calendar (such as Eid al-Fitr and Eid al-Adha), does not constitute one of the five Pillars. These festivals are expressions of community and faith but are not mandatory acts of worship in the same way that the other pillars are. Therefore, the option regarding celebration of festivals is correctly identified as not being one of the five Pillars.