What is the ruling on buying a commercial shop, including its merchandise, employees, and a ledger of debts owed by customers unknown to the buyer, with no documentation for these debts other than the ledger itself?

It is permissible to purchase a shop with all its contents, but it is not permissible to purchase the shop's debts because that falls under selling debt, which could be explicit usury if the price is paid (Riba al-Nasi'ah), or selling debt for debt if the price is deferred, both of which are prohibited and involve gharar (excessive uncertainty). As for the worker being included in the deal: if he is within the term of his lease to the first owner, it is permissible for his wages and work to be included in the deal, and he does not take wages from the new owner, and it is permissible to combine sale and lease in one contract. However, if the buyer stipulates that the seller leases his worker, it is not permissible; it is a void condition that invalidates either the sale or the condition alone.