Musannaf Ibn Abi Shaybah

It is narrated from Muhammad, may Allah have mercy on him, that a man dyed a cloth with Harwi color. Another person came to him and asked, "How are you selling this Harwi cloth?" He remained silent and then named its price. That person bought it from him. When he took the cloth away, it turned out not to be Harwi. The man took his dispute to Hazrat Shurayh, who said: "If you can adorn your cloth even better than this, then by all means adorn it." He enforced the sale upon him.