سنن النسائي 4517

It was narrated from Hafs bin 'Asim, from Abu Hurairah that the Prophet forbade two kids of transactions:Munabadhah and Mulamasha. And he said that Mulamasah means when one man says to another: "I will sell you my garment for your garment," and neither of them looks at the garment of the others, rather he just touches it. And Munabadhah is when he says: "I will throw what I have and you throw what you have," so that they buy from one another, and neither of them knows how much the other has, and so on

Rapporté par Hafs bin ‘Asim, d’après Abu Hurairah : Le Prophète ﷺ a interdit deux types de transactions : Munabadhah et Mulamasha. Il a expliqué que Mulamasah, c’est quand un homme dit à un autre : "Je te vends mon vêtement contre le tien", et aucun des deux ne regarde le vêtement de l’autre, il le touche seulement. Munabadhah, c’est quand il dit : "Je lance ce que j’ai et tu lances ce que tu as", afin qu’ils achètent l’un de l’autre, sans savoir ce que l’autre possède, et ainsi de suite