The most important and basic obligation (fard) of Hajj is **Wuquf-e-Arafah**, which means standing at the plain of Arafat. It is so essential that without this action, the Hajj is not valid. Pilgrims must be present at Arafat on the 9th day of Dhul Hijjah. The Prophet Muhammad ﷺ said, “Hajj is Arafah,” which shows how critical this part is.

Other actions like Sa’i (walking between Safa and Marwah) and Rami (throwing pebbles at Jamarat) are also part of Hajj but are not as crucial as Wuquf-e-Arafah. Missing Wuquf means the entire Hajj is invalid. This shows how important it is in fulfilling the duty of Hajj.