The Messenger of Allah ﷺ said, "Do not make two transactions in one sale."
قال رسول الله ﷺ: لا تبع بيعتين في بيعة.
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Tirmidhi (1309), Ibn Majah (2404), Ahmad (5395), Ibn Jarud (599), and Bayhaqi (6/77) all narrated it through various routes from Hushaym bin Bashir, who said, "Yunus bin Ubayd narrated to us, from Nafi, from Ibn Umar," and mentioned it as part of a hadith that begins, "Delaying payment by a wealthy person is injustice, and if you are referred to someone solvent, follow him." Ibn Majah mentioned only the beginning of the hadith.Note, the manuscripts of Tirmidhi differ on this. This hadith is found in some of them and not found in others, so it should be verified.The scholars differed regarding whether Yunus bin Ubayd actually heard from Nafi. Ahmad, Bukhari, Abu Hatim, and Abu Dawud held that he heard nothing from him at all, and that he only heard from Ibn Nafi, who heard from Nafi. Abu Zura withheld judgment, saying, "I suspect there is something in his hadith indicating that he did hear from him." (Marasil, 191)Tahawi affirmed in his Mushkil (7/178) that Yunus did hear from Nafi, based on what he related from his teacher Abu Umaya, who said, Mualla bin Mansur narrated to us, saying, Hushaym narrated to us, saying, Yunus bin Ubayd informed us, saying, Nafi informed us, from Ibn Umar, who said, The Messenger of Allah ﷺ said, "If you are referred to someone solvent, follow him." This is part of the hadith, and its chain explicitly states that he was informed directly.Then he said, "However, we found that Yahya bin Main spoke about this hadith of Ibn Umar, and mentioned that Yunus bin Ubayd did not hear it from Nafi. Ibn Abu Dawud narrated to us that Yahya bin Main said to him, regarding the hadith of Yunus bin Ubayd from Nafi from Ibn Umar, 'Delaying payment by a wealthy person is injustice,' 'I heard this from Hushaym, but Yunus did not hear it from Nafi.' Ibn Abu Dawud said, 'I said to Yahya, "Did Yunus hear nothing at all from Nafi?"' He said, 'Yes, he did, but this particular hadith Yunus did not hear from Nafi.'"From this, Tahawi concluded that the part Yunus did not hear from Nafi was the statement "Delaying payment by a wealthy person is injustice," and that he heard everything else in it directly from him. I would add that this includes the other part of the hadith as well, namely "Do not sell two sales in one sale." And Allah, the Exalted, knows best.It has also been narrated from Ibn Masud, but only as his own statement, not going back to the Prophet, "Two transactions in one transaction are not valid." Ahmad (3725) and Ibn Hibban (5025) both narrated it from the hadith of Shuba, from Simak bin Harb, from Abdul-Rahman bin Abdullah bin Masud, from his father. Likewise, Ibn Khuzayma (176), Ibn Hibban (1053), Bazzar in Kashf Astar (1278), and Tabarani in Kabir (9/321) all narrated it from the hadith of Sufyan Thawri, from Simak bin Harb, from Abdul-Rahman bin Abdullah bin Masud, from his father. It has other chains as well through Simak bin Harb, attributed only to Ibn Masud and not going back to the Prophet.Sharik Nakhai differed from them, narrating it from Simak bin Harb, from Abdul-Rahman bin Abdullah bin Masud, from him, as a hadith traced back to the Prophet, saying, "The Messenger of Allah ﷺ forbade two transactions in one transaction." Ahmad (3783) and Bazzar in Kashf Astar (1277) both narrated it from Aswad bin Amir, who said, "Sharik narrated it to us," and he mentioned it accordingly.Sharik here is Sharik bin Abdullah, who had poor memory, and this is one of the mistakes he made. The correct view is that it is attributed only to Ibn Masud, not going back to the Prophet.Simak explained the meaning of his phrase "two transactions in one transaction" (spelled with the letter sin), also transmitted with the same meaning (spelled with the letter sad), saying, "This refers to a man selling something and saying, 'It is such and such on credit, and it is such and such in cash.'" That is, then the two of them part without having settled on which of the two sales they actually agreed upon.