Musannaf Ibn Abi Shayba 23:108

Abu Khalid al-Ahmar narrated to us, from Ibn ‘Ajlan, from ‘Abdullah ibn Dinar, from Abu Salih, from Abu Hurayrah, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Faith is sixty or seventy, or a few more, or one of the two numbers. Its highest is the testimony that there is no god but Allah, and its lowest is removing harm from the road. And modesty is a branch of faith."