1-In what year was Hajj made obligatory?

There is a difference of opinion regarding the year in which Hajj was prescribed. It was said: the sixth year, citing as evidence the Almighty's saying: "And complete the Hajj and 'Umrah for Allah," which was revealed in Al-Hudaybiyah in the sixth year. And it was said: the seventh year, and it was said: the eighth year, and it was said: the ninth or tenth year.