“I once asked abu Basir to ask abu ‘ Abd Allah (a.s.), about the case of a man who exchanges two baskets of fresh half-ripe dates for one basket of Mushaqaq (stone-free) dates. Abu Basir asked him (the Imam) and he (the Imam) said, ‘It is Makruh (detestable).’ Abu Basir then asked, ‘Why it is Makruh (detestable)?’ He (the Imam) said, ‘Ali ibn abu Talib (a.s.), disliked to exchange one wasaq of dates of al-Madinah for two wasaq (a certain unit of measurement) of dates of Khaybar because dates of al-Madinah are of inferior quality and Ali (a.s.), would not dislike lawful things.’”