Those who disliked that

Yahya bin Abi Kathir says that Sayyiduna Umar (may Allah be pleased with him) sent a slave of his with one sa' of dates to bring one sa' of barley in exchange for it, and he strictly forbade him from taking anything at all beyond one sa'.

Abu Abd al-Rahman used to regard it as disliked that two qafiz of barley be obtained for one qafiz of wheat.

Sulayman bin Yasar says that the slave of Abd al-Rahman bin al-Aswad bin Abd Yaghuth came to him and told him that the barley for his riding animal had run out. He ordered him to take wheat and buy barley with it, and told him to take it in equal measure and not to take more. Sulayman bin Yasar has also reported the same regarding Sayyiduna Sa'd bin Abi Waqqas (may Allah be pleased with him).

Nafi' said: Sulayman bin Yasar also informed me of the like of this regarding Sayyiduna Sa'd bin Abi Waqqas (may Allah be pleased with him).