Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates: I saw that in the blessed era of the Prophet (peace and blessings be upon him), those grain dealers were beaten who, after buying grain by estimation, would sell it to others before transferring it to their own designated place.
Hadith Referenceصحیح ابن حبان / كتاب البيوع / 4987
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح الإسناد.فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده قوي