Narrated Abu Musa (radiyallaahu-anhu): The Prophet (sallal-laahu-alayhi-wasallam) said, ‘’My example, and the example of what I have been sent with is that of a man who came to some people and said, O people! I have seen the enemy’s army with my own eyes and I am a plain warner; so protect yourselves!’ Then a group of his people obeyed him and fled at night proceeding stealthily till they were safe, while another group of them disbelieved him and stayed at their places till morning when the army came upon them and killed and ruined them completely. So this is the example of that person who obeys me and follows that truth which I have brought (the Qur’aan and the Sunnah), and the example of the one who disobeys me and disbelieves the Truth I have brought.
[Saheeh Al-Bukhaari. Vol 9. Number: 7283]