Musannaf Ibn Abi Shayba 13:2520

Abu Bakr narrated to us, he said: Abu Khalid al-Ahmar narrated to us, from Hajjaj, from ‘Amr, from Tawus, from Ibn ‘Abbas, he said: The prohibition was only regarding what is measured by volume and what is weighed. And I do not consider what is other than that except to be like it.