Musannaf Ibn Abi Shayba 13:1138

Abu Bakr narrated to us, he said: Muhammad ibn Yazid narrated to us, from Ayyub Abu al-Ala, from Qatada and Abu Hashim. They both said regarding a man who buys ghee and honey on the condition that he pays for such-and-such amount of containers: They claimed that it is disliked.