Sahih al-Bukhari, Hadith 1486 ⓘ
Narrated Ibn `Umar: The Prophet had forbidden the sale of dates till they were good (ripe), and when it was asked what it meant, the Prophet said, "Till there is no danger of blight."
حَدَّثَنَا حَجَّاجٌ، حَدَّثَنَا شُعْبَةُ، أَخْبَرَنِي عَبْدُ اللَّهِ بْنُ دِينَارٍ، سَمِعْتُ ابْنَ عُمَرَ ـ رضى الله عنهما ـ نَهَى النَّبِيُّ صلى الله عليه وسلم عَنْ بَيْعِ الثَّمَرَةِ حَتَّى يَبْدُوَ صَلاَحُهَا. وَكَانَ إِذَا سُئِلَ عَنْ صَلاَحِهَا قَالَ حَتَّى تَذْهَبَ عَاهَتُهُ.
also referenced under: Book 24, Hadith 87 (In-Book) & Volume 2, Book 24, Hadith 563 (USC-MSA)