When was hajj obligated?

Hajj was obligated in the year 9 AH (After Hijrah), which corresponds to 630 CE. This obligation was established after the Quranic revelation in Surah Al-Imran, verse 97, which commands Muslims to perform the pilgrimage to the Kaaba in Mecca, provided they have the means to do so. Hajj is one of the Five Pillars of Islam, emphasizing its significance in the faith.