What is the way to obtain money to marry off my son or to repair my house?

Question:
May Allah reward you. Honorable Shaykh, a questioner says: I want to take a sum of money to marry off my son and also to repair my house. In your view, and according to the method of the Islamic Shari'ah in correcting this, what is the best way to obtain this money from a man who buys and sells, or from a commercial institution?

Answer:
Either he lends you a benevolent loan (qard hasan) to meet your need, and then you return to him the amount you took from him as this benevolent loan. Or you resort to the matter of tawarruq (a commodity sale used to obtain cash): you buy from him a commodity he owns before the contract, then you take possession of it from him and sell it to someone else, and you benefit from its price. When the due date arrives, you pay off his debt, which is the price of the commodity you bought from him on credit. Yes.