In one narration the words are: "He forbade selling dates until their ripeness becomes apparent."
Al-Tabarani recorded it in al-Mu'jam al-Kabir through various chains, the narrators of some of which are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب البيوع / 6489
Hadith Gradingمحدثین:إسنادہ حسن
Hadith Takhrij«اخرجه الطبراني فى المعجم الكبير (11187)»