Narrated Nafi':
from Ibn 'Umar, that the Messenger of Allah (ﷺ) said: Indeed Allah has put the truth upon the tongue and in the heard of 'Umar. He said: And Ibn 'Umar said: 'No affair occurred among the people, except that they said something about it, and 'Umar said something about it' or he said - Ibn Al-Khattab - Kharijah (one of the narrators) had a doubt about it - except that the Qur'an was revealed in line with what 'Umar had said.