Sa'id bin al-Musayyib narrates: I heard Sayyiduna Uthman Ghani (may Allah be pleased with him) say while delivering a sermon on the pulpit: "I used to buy dates from a clan of the Jews who were called Banu Qaynuqa', and I would sell them at a profit. News of this reached the Prophet (peace and blessings be upon him), and he said: 'O Uthman! When you buy, take it by measure, and when you sell, give it by measure.'" (Allamah al-Haythami says:) I say:
Ibn Majah recorded this narration in abridged form.
Ahmad recorded it, and its chain is hasan (good).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب البيوع / 6463
Hadith Gradingمحدثین:إسنادہ حسن۔
Hadith Takhrij«اخرجه احمد فى المسند (444 و 445) ، أخرجه مسند أحمد برقم: 561»