Musannaf Ibn Abi Shayba 13:2091

Abu Bakr narrated to us, he said: Ibn Fudayl narrated to us, from Yazid ibn Abi Ziyad, from al-Musayyib ibn Rafi' al-Kahili, from Ibn Mas'ud, he said: Do not buy fish while it is in the water, for it is uncertainty (gharar).