Sahih al-Bukhari 1488

Arabic

حَدَّثَنَا قُتَيْبَةُ، عَنْ مَالِكٍ، عَنْ حُمَيْدٍ، عَنْ أَنَسِ بْنِ مَالِكٍ ـ رضى الله عنه ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَى عَنْ بَيْعِ الثِّمَارِ حَتَّى تُزْهِيَ، قَالَ حَتَّى تَحْمَارَّ‏.‏

English translation

Narrated Anas bin Malik:Allah's Messenger (ﷺ) forbade the selling of fruits until they were ripe. The Prophet (ﷺ) added, "It means that they become red

Reference: Sahih al-Bukhari 1488, Book of Obligatory Charity Tax (Zakat). English translation by Dr. Muhammad Muhsin Khan.