Sayyidah Aishah Siddiqah (may Allah be pleased with her) reports this saying of the Prophet (peace and blessings be upon him): "Do not sell your fruits until their ripeness becomes apparent and they are safe from blight."
Ahmad recorded it, and its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب البيوع / 6486