The Prophet ﷺ had a craving for dates, so he sent one of his wives, and I believe it was none other than Umm Salama, with two saa of dates to exchange. They returned with one saa of ajwa dates. When the Prophet ﷺ saw it, he did not approve of it and asked, "Where did you get this from?"They replied, "We sent two saa and received one saa in return."He said, "Take it back, I have no need for it."
أن النبي ﷺ اشتهى تمرا، فأرسل بعض أزواجه- ولا أراها إلا أم سلمة- بصاعين من تمر، فأتوا بصاع من عجوة، فلما رآه النبي ﷺ لا أنكره، فقال: من أين لكم هذا؟ قالوا: بعثنا بصاعين فأتينا بصاع فقال: ردوه، فلا حاجة لي فيه.
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Tahawi narrated it in Sharh Maani al-Athar (4/66) — and this is his wording — and Tabarani in Al-Awsat, Majma Bahrayn (2026), both through the route of Yahya bin Main, who said, "Fadl bin Habib Sarraj narrated to us, Hayan Abu Zuhayr narrated to us, from Ibn Burayda, from his father," who said, then he related it.Its isnad is hasan because of Fadl bin Habib Sarraj Madaini, of whom Ibn Main said, "There was nothing wrong with him." Tarikh Baghdad (12/339). His teacher Hayan is Ibn Ubaydullah bin Zuhayr, Abu Zuhayr Adawi, of whom Abu Hatim said, "Truthful." Al-Jarh wal-Tadil (3/246).His saying, "Return it," contains a confirmation of the annulment of a usurious sale according to the majority of scholars. The Kufans, however, said, "The sale is valid, and only the excess is to be returned."