Final answer:
Traveling to Mecca is essential for fulfilling the pillars of Islam.
Explanation:
The necessary action for fulfilling the pillars of Islam is traveling to Mecca, also known as the pilgrimage or Hajj. This pilgrimage is one of the Five Pillars of Islam, which are essential obligations in the faith. It involves visiting the holy city of Mecca at least once in a lifetime for those who are able and can afford to do so.
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