Musannaf Ibn Abi Shayba 13:1241

Abu Bakr narrated to us, he said: 'Abbad bin al-'Awwam narrated to us, from Yahya bin Sa'id, from Abu Bakr bin 'Amr bin Hazm, from his father, that he sold a fruit [crop] of his for four thousand, and he excepted from it eight hundred.