مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3337
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
'Amr bin Deenar narrated that Ibn ‘Abbas (رضي الله عنه) used to say: The Messenger of Allah (ﷺ) said: "Dates should not be sold until they become edible.”
Musnad Ahmad 3361Its isnad is saheeh]