Musannaf Ibn Abi Shayba 13:1855

Abu Bakr narrated to us, he said: Yahya ibn Sa'id al-Qattan narrated to us, from 'Abd al-Malik ibn Abi Kathir, he said: I heard Sa'id ibn al-Musayyib saying: "The fruit shall not be sold until it shows color (tazhu) and is safe from blight."