Performing Hajj (pilgrimage) by Adult mindful Muslims who can afford it physically, financially, and securely.
yes, the concept of each of the 5 pillars of Islam is mentioned in the Holy Quran .
pilgrimage (or Hajj)
The second pillar of Islam is Salah (prayer). Refer to the related question below.
The Five Pillars of Islam are the five important beliefs and doings that every Muslim should adopt as as the basis to be Muslim. These five pillars are: Shahada [testimony that there is no god except...