(14) باب تَحْرِيمِ بَيْعِ الرُّطَبِ بِالتَّمْرِ إِلاَّ فِي الْعَرَايَا
Zaid b. Thabit (Allah be pleased with him) reported Allah's Messenger (ﷺ) granting concession in case of 'ariyya transactions and that implies selling of (dry dates for fresh dates) according to a measure.
Reference: Sahih Muslim 1539 h
In-book reference: Book 21, Hadith 83
USC-MSA web (English) reference(deprecated numbering scheme): Book 10, Hadith 3684