Abd Said reported: Bilal (RA) came with fine quality of dates. Allahs Messenger ﷺ said to him: From where (you have brought them)? Bilal (RA) said: We had inferior quality of dates and I exchanged two sas (of inferior quality) with one sa (of fine quality) as food for Allahs Apostle ﷺ , whereupon Allahs Messenger ﷺ said: Woe! it is in fact usury; therefore, dont 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"