In the prohibition of selling fruits until they ripen

Khālid b. Makhlad > Mālik > Nāfiʿ > Ibn ʿUmar

The Messenger of Allah ﷺ forbade the sale of fruits till they were clearly in good condition, forbidding it both to the seller and to the buyer. – Strong Chain

أَخْبَرَنَا خَالِدُ بْنُ مَخْلَدٍ حَدَّثَنَا مَالِكٌ عَنْ نَافِعٍ عَنْ ابْنِ عُمَرَ قَالَ

«نَهَى رَسُولُ اللَّهِ ﷺ عَنْ بَيْعِ الثِّمَارِ حَتَّى يَبْدُوَ صَلَاحُهَا نَهَى الْبَائِعَ وَالْمُشْتَرِيَ» – إسناده قوي