Musannaf Ibn Abi Shayba 16:137

Abu Bakr narrated to us, he said: Abd al-Rahim and Waki’ narrated to us, from Fitr, from Mundhir, from Muhammad ibn al-Hanafiyyah, that when he was asked about the eel and the spleen—Waki’ said: and things that are disliked—he would recite this verse: "Say, 'I do not find within that which was revealed to me [anything] forbidden...'"