Musannaf Ibn Abi Shaybah

Hazrat Saeed bin Musayyib says that exchanging wheat for flour is usury.

Ibrahim considered the sale of dates (sattu) in exchange for wheat and similar items to be disliked.

Hazrat Mujahid says that there is no harm if wheat is sold in exchange for flour, wheat is sold in exchange for sattu, flour is sold in exchange for wheat, bread is sold in exchange for wheat, and one coin is sold in exchange for two coins, provided it is done hand to hand.

Hazrat Ibn Aun (may Allah be pleased with him) narrates that Muhammad was asked about the sale of bread in exchange for wheat, so he replied that bread is made from wheat.

Hazrat Sha’bah says that I asked Hazrat Hakam and Hazrat Hammad about the sale of flour for wheat, so they considered it disliked.

Hazrat Hakam considered the sale of roasted barley in exchange for wheat to be disliked.

Hazrat Aamir was asked about the sale of roasted barley (sattu) in exchange for wheat, so he replied: "If there is no usury in it, then at least there is a suspicion of usury."

Hazrat Shu’bah says that I asked Hazrat Hakam and Hazrat Hammad about selling one qafeez of wheat in exchange for two qafeez of flour, so they declared it disliked.

Hasan says that if they are equal, then it is not disliked.

Hasan says that if they are equal, then it is not disliked.

Hazrat Qatadah says that if they are equal, then it is not disliked.