مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2268
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn ‘Abbas (رضي الله عنه) that The Messenger of Allah (ﷺ) forbade selling foodstuff until it has been received in full. I [the narrator] said to him: Why was that? He said: It would be just like selling dirhams for dirhams, as the food is something postponed.
Musnad Ahmad 2275Its isnad is saheeh, al-Bukhari (2135) and Muslim (1525)]