Why is hajj important in quran? The hajj is a pillar of Islam, required of all Muslims once in a lifetime. It is a physically hardworking journey that Muslims believe offers a chance to wipe clean past sins and start anew before God. Moreover, Pilgrims seek to deepen their faith in the hajj. Online Quran classes are an excellent way to learn about Islam and the teachings of the Quran from the comfort of your own home.