It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "Do not buy or sell fruit until it has ripened."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 5184
Hadith Gradingحکم دارالسلام:إسناده صحيح ، م : 1534 .