Explanation of the hadith of the Prophet (peace and blessings be upon him) prohibiting two sales in one sale

Question : He says: It is reported in a hadith that the Messenger of Allah (peace and blessings be upon him and his family) prohibited two sales in one sale. It is also established from some of the Salaf that the meaning of the hadith is . The question is: What is the meaning? Perhaps what is the correct meaning of this hadith?

Answer : This is what you intend, knowing that this issue is widespread, so I hope for a clear explanation. As for the interpretation of some of them, who say, "I sold this to you for ten cash or twenty on credit," that is an interpretation that has no validity and does not match the hadith. Because if he says, "I will take it for ten cash," how many sales is that? One sale. And if he says, "For twenty on credit," the sale is one sale; there are not two sales. The correct view is that the hadith of the Messenger explains itself, where he (peace and blessings be upon him) said . This applies exactly to the issue of 'inah, where one sells an item for one hundred on credit, then buys it back from the buyer for eighty cash. Here there are two sales. What was the first sale for?
And the second was for eighty, and the item sold is the same. So his saying "in one sale" means in one item sold. So he has two options. What are his two options? The eighty. Either he takes the eighty and says to the first buyer, "Twenty is dropped from you," or he invalidates the first sale as it is and takes the riba (usury or interest), which is the twenty excess over the eighty. This is the most correct thing said about it, because the hadith explains itself. As for the issue of ten cash or twenty on credit, the issue is one sale, but which is better?