The Rights of Acts
Risālat al-Ḥuqūq|Volume 1|Book 1|Chapter 3
وَأَمَّا حَقُّ الحَجّ أَنْ تَعْلَمَ أَنّه وِفادةٌ إلى رَبّكَ، و فِرارٌ إليه من ذُنوبكَ و بهِ قبولُ تَوبتِكَ وقَضاءُ الفَرضِ الَّذي أوجَبَه الله عَليك
The right of the hajj is that you know it is an arrival before your Lord and a flight to Him from your sins; through it your repentance is accepted and you perform an obligation made incumbent upon you by God.