How must a seller disclose modifications or improvements made to the item before resale on murabaha?
Chapter on Selling the Musarrah (Animal with milk retained in udder)
Al-Mughni
Book of Sales
Primary text
If work was performed on the item, such as shortening, mending, beautifying, or tailoring it, the seller must disclose the status in detail when selling on murabaha, regardless of whether the work was done by the seller or by someone hired by the seller. This aligns with the apparent position of Ahmad, who stated that what was bought and what the seller incurred must be explained, and it is impermissible to state, 'It cost me such and such amount' (tahassala 'alayya bi kadha). This is the position of Al-Hasan, Ibn Sirin, Sa'id ibn al-Musayyab, Tawus, Al-Nakha'i, and Al-Awza'i.
Supporting text
There is a view that it is permissible to include costs for hired labor and state, 'It cost me such and such,' based on the argument that the statement is truthful. This view is held by Al-Sha'bi, Al-Hakam, and Al-Shafi'i. The counter-argument is that including labor costs constitutes deception, as the buyer might not have agreed to the price if they knew part of the cost was for craftsmanship.