Are all the dates of Khaibar like this)? He said: No. We got one sa' (of fine dates) for two sa's (of inferior dates), and (similarly) two sa's for three sa's. Thereupon Allah's Messenger (ﷺ) said: Don't do that rather sell the inferior quality of dates for dirhams (money), and then buy the superior quality with the help of dirhams.
Sahih Muslim Book 22, Hadith 121
← Previous Hadith Are all the dates of Khaibar like this? He said: Allah's Messenger, it is not so. We buy one sa' of (fine quality of dates) for two sa's out of total output (including even the inferior quality of dates), whereupon Allah's Messenger (ﷺ) said: Don't do that, but like for like, or sell this (the inferior quality and receive the price) and then buy with the price of that, and that would make up the measure.

Sahih Muslim Book 22, Hadith 120 Next Hadith → Bilal (Allah be pleased with him) came with fine quality of dates. Allah's Messenger (ﷺ) said to him: From where (you have brought them)? Bilal said: We had inferior quality of dates and I exchanged two sa's (of inferior quality) with one sa (of fine quality) as food for Allah's Apostle (ﷺ), whereupon Allah's Messenger (ﷺ) said: Woe! it is in fact usury; therefore, don't do that. But when you intend to buy dates (of superior quality), sell (the inferior quality) in a separate bargain and then buy (the superior quality). And in the hadith transmitted by Ibn Sahl there is no mention of" whereupon".

Sahih Muslim Book 22, Hadith 122