مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1867
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn ‘Abbas said: When the Messenger of Allah (ﷺ) came to Madinah, the people paid for dates one or two years in advance - or he said: two or three years. He said: "Whoever pays in advance for dates, let him pay for a specified measure and a specified weight.”
Musnad Ahmad 1868Sahih (Darussalam) [, al Bukhari (2239) and Muslim (1604)]