Musnad Abu Ya'la al-Mawsili 42:389

And from Abu Sa'id al-Khudri that he heard the Messenger of Allah, may Allah bless him and grant him peace, saying: "The righteous vision is one part of forty-five parts of prophethood." Yazid said: I heard Abu Salamah narrating this hadith from Abu Hurayrah to Umar ibn Abd al-Aziz. Umar said: "If it were a pebble from the number of pebbles, I would have seen it to be true."