Musannaf Ibn Abi Shayba 13:1737

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: An-Nadr ibn Abi Maryam Abu Laynah narrated to us, from Ad-Dahhak, that he granted a concession for *as-salam* (forward sale) in livestock. Then he retracted it.