Musnad Ahmad Hadith 10370

It is narrated from Abu Hurairah (may Allah be pleased with him) that the Noble Prophet (ﷺ) said: He forbade two types of buying and selling and two types of clothing. As for clothing, it is that a person sits wrapped in a single garment with nothing covering his private parts, and that a person prays wrapped only in his lower garment unless he throws its two ends over his shoulders in opposite directions. And he forbade the sale by "mulamasa" and the sale by throwing a stone. Benefit: The meaning of "bay‘ mulamasa" is that the buyer says, "Whatever thing I touch with my hand will be mine for such and such amount."