Who refers to the Muslims obligation to undertake a pilgrimage to mecca?

The obligation for Muslims to undertake a pilgrimage to Mecca, known as Hajj, is referred to in the Quran, specifically in Surah Al-Imran (3:97), which states that it is a duty to perform Hajj for those who are able to do so. This pilgrimage is one of the Five Pillars of Islam, which are fundamental acts of worship and practice for Muslims. It underscores the importance of spiritual devotion and unity among the Muslim community worldwide.