Is murabaha selling permissible, or is it a circumvention of religion if the buyer wishes to take a portion of what was purchased in cash and the other portion in exchange for money at its price?

Murabaha sale is a sale at cost price with a known profit, and it is permissible, with no disagreement regarding its validity. As for Murabaha to the one who promises to buy, which is practiced by Islamic banks, it is also permissible according to the preponderant opinion of scholars.

As for what is meant by benefiting from a part of the price of the commodity, that is Tawarruq. Scholars have differed regarding its ruling, and the preponderant view is that it is permissible due to the absence of a text prohibiting it.