وسبب وجوب الحج «البيت» لإضافته إلى البيت
The source connects the Hajj obligation to the Sacred House, to which the pilgrimage is related.
Ability to undertake the pilgrimage remains a crucial condition, but identifying a condition is not identical to identifying the cause. The association with the House and the person's ability play distinct roles.
A person who duly fulfills the obligatory Hajj does not acquire a new obligatory Hajj each calendar year merely because the House still exists. The source distinguishes the unity of the occasion, qualifying conditions and the law's specified amount of performance.