" لاَ تَبِيعُوا الثَّمَرَ حَتَّى يَبْدُوَ صَلاَحُهُ وَلاَ تَبْتَاعُوا الثَّمَرَ بِالتَّمْرِ "
It was narrated that Abu Hurairah said: "The Messenger of Allah said: 'Do not sell fruits until their condition is known, and do not sell fresh dates (still on the tree) for dried dates."' Ibn Shihab said: "Salim bin 'Abdullah narrated to me, from his father: 'That Allah's Messenger forbade from ..." similarly.