The chapter’s reasoning proceeds in sequence:
1. Establish a qualifying, pre-existing trade defect.
2. Check prior disclosure and contractual waiver.
3. If return is available, choose return or retention at the full price.
4. If later damage or inseparable additions prevent return, consider arsh and seller consent.
5. Distinguish judicial from voluntary return in onward sales and remember the stated disagreement on destruction or consumption.
The next chapter is al-bay‘ al-fasid, invalid/irregular sales.