"The Prophet ﷺ prohibited selling ears (of grain) until they have whitened (shown their kernals) and are safe from blight, he forbade it for the seller and the buyer." [He said:] There are narrations on this topic from Anas, Ibn 'Abbas, Jabir, Abu Sa'eed, and Zaid bin Thabit.
أَنَّ النَّبِيَّ ﷺ نَهَى عَنْ بَيْعِ السُّنْبُلِ حَتَّى يَبْيَضَّ وَيَأْمَنَ الْعَاهَةَ نَهَى الْبَائِعَ وَالْمُشْتَرِيَ قَالَ وَفِي الْبَابِ عَنْ أَنَسٍ وَعَائِشَةَ وَأَبِي هُرَيْرَةَ وَابْنِ عَبَّاسٍ وَجَابِرٍ وَأَبِي سَعِيدٍ وَزَيْدِ بْنِ ثَابِتٍ