Exchange of One Kind of Food Items for another Kind

10. A number of our people have narrated from Ahmad ibn Muhammad from al-Husayn ibn Sa‘id from Jamil from Muhammad ibn Muslim and Zurarah who have said the following: “Abu Ja‘far عليه السلام, has said, ‘It is permissible to exchange wheat with flour in equal measures and sawiq (mush) of wheat with mush and barley with wheat in equal measures, is not harmful.’”