On which day of Dhul Hijjah do pilgrims gather at the plain of Arafat, considered the most essential rite of Hajj?

Explanation

– The gathering at the plain of Arafat on the 9th of Dhul Hijjah, known as the Day of Arafat, is considered the most essential rite of Hajj, without which the pilgrimage is deemed invalid.
– Pilgrims spend the day in prayer, supplication, and reflection.
– For exams, remember that the Prophet (PBUH) delivered his famous Farewell Sermon at Arafat during his only Hajj in 10 AH.