Hazrat Jameel bin Abdur Rahman said to Saeed bin Musayyib: I buy those grains which are allotted to people by the government, then I wish to sell the grain to people on a fixed term. Saeed said: You wish to pay those people from the same grain which you have bought. Jameel said: Yes. Saeed bin Musayyib forbade him from this.
Imam Malik, may Allah have mercy on him, said: In our view, this ruling is agreed upon, that whoever buys grain, such as wheat, barley, millet, bajra, and lentils, etc., in which zakat is obligatory, or things eaten with bread, such as olive oil, or ghee, or honey, or vinegar, or cheese, or milk, or sesame oil, and things similar to these, then none of these things should be sold until he has taken possession of them.
Hadith Referenceموطا امام مالك رواية يحييٰ / كتاب البيوع / 1348