Musnad Ahmad Hadith 8949

It is narrated from Abu Hurairah (may Allah be pleased with him) that the Noble Prophet (ﷺ) 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 at all, and that a person wraps himself in his lower garment while praying. And he forbade two types of sales: (1) Mulamasa, that is, the buyer says, "You throw something towards me or I throw something towards you," and (2) the sale by throwing a stone.