Musannaf Ibn Abi Shayba 33:953

'Abd al-Wahhab al-Thaqafi narrated to us, from Ayyub, from the scribe of Abu Qilabah, who said: The likeness of the scholars is like the stars by which one is guided, and the landmarks by which one is followed. If they are hidden from them, they become confused, and if they abandon them, they go astray.