Muwatta Imam Malik Book of Business Transactions, Hadith 72
Yahya related to me from Malik that he had heard that the Messenger of Allah ﷺ forbade two sales in one sale.
حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ . أَنَّ رَسُولَ اللَّهِ ﷺ نَهَى عَنْ بَيْعَتَيْنِ فِي بَيْعَةٍ .