It was narrated from Ibn 'Umar that the Prophet (ﷺ) said:
"O Allah, bless my nation in their early mornings.". It was narrated from Abu Hurairah that the Prophet (ﷺ) said: "Whoever buys a Musarrah, he has the choice (of annulling the deal) for three days. If he returns it, then he must also give a Sa' of dates, not Samra'." Meaning wheat. (FR)
English reference (FR): Vol. 3, Book 12, Hadith 2238 (FR)
Arabic reference (FR): Book 12, Hadith 2324 (FR)