Sunan An-Nasa'i

It was narrated from Anas bin Malik that:the Messenger of Allah forbade selling fruits before they ripen. It was said: ""O Messenger of Allah what does ripen mean?"" he said: 'when they turn red."" And the Messenger of Allah said: ""What do you think if Allah withholds the fruits (causes it not to ripen), why would any one of you take his brother's wealth?