When Hajj became obligatory.

The Shaykh : When did Hajj become obligatory? According to the stronger opinion, Hajj became obligatory in the ninth or tenth year of the Hijrah. It was not made obligatory before that. Although tawhid (the oneness of Allah) was obligatory from the very beginning of the Prophet’s mission, and the prayer was made obligatory before the Hijrah, and zakah (the obligatory alms) was either made obligatory before the Hijrah with its details clarified after the Hijrah, or it was not made obligatory until after the Hijrah, and fasting was made obligatory after the Hijrah, yet Hajj was delayed until the ninth or tenth year. Why? The wisdom is clear, my brothers. Because Makkah—may Allah exalt its honor—was in the hands of the polytheists until the eighth year. They prevented whom they wished and permitted whom they wished, to the extent that they prevented the Prophet (peace and blessings be upon him) from completing his 'Umrah (the lesser pilgrimage) in the year of Hudaybiyyah. It was not wise to oblige people to perform Hajj when they might be turned back along the way. So the obligation of Hajj was delayed until Makkah was conquered in the eighth year. Now, if we say that Hajj was made obligatory in the ninth year, did the Messenger (peace and blessings be upon him) perform Hajj? Did he perform it as soon as it was made obligatory? No. He did not perform it, because the Prophet (peace and blessings be upon him and his family) delayed Hajj for two reasons:
The first is that he (peace and blessings be upon him and his family) remained in Madinah to receive the delegations of the Arabs who were coming as Muslims. Because when Makkah and al-Ta’if were conquered, their power was broken. They began to enter the religion of Allah in large groups. So he remained in Madinah receiving the delegations, teaching them the religion, and then they would depart. This is one reason. Another reason is that in the ninth year—our brothers—both Muslims and polytheists performed Hajj. So Allah the Exalted chose for His Prophet (peace and blessings be upon him and his family) that his Hajj would not be mixed with polytheists. For this reason, when Abu Bakr (may Allah be pleased with him) led the people in Hajj in the ninth year, the announcer called out: . So the Prophet (peace and blessings be upon him) delayed Hajj for two reasons:
The first: remaining in Madinah to receive the delegations.
And the second: that no one from among the polytheists be with him.