Musannaf Ibn Abi Shayba 13:799

Abu Bakr narrated to us, he said: Hammad ibn Khalid narrated to us, from Malik ibn Anas, from Abu al-Zinad, from Sa'id ibn al-Musayyib and Sulayman ibn Yasar, they both said: "Whoever sells food for gold on a deferred term, and then the term becomes due, do not take dates in exchange for it."