مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2570
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn ‘Abbas (رضي الله عنه) said: The Messenger of Allah (ﷺ) forbade selling foodstuff until one has taken full possession of it. Ibn 'Abbas (رضي الله عنه) said: I think all sales are like this.
Musnad Ahmad 2585Its isnad is saheeh, al- Bukhari (2135) and Muslim(1525)]