مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2305
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
The Messenger of Allah (ﷺ) said: "Do not go out to meet incoming traders, do not leave the milk of a she-camel or sheep to accumulate [in its udder, so as to deceive a prospective buyer], do not try to sell by artificial means.”
Musnad Ahmad 2313Hasan because of corroborating evidence, and its isnad is da