Sunan Abu Dawud
5111
Sahih+3

Abu Hurairah said; His companion came to him and said; Messenger of Allah! We have thoughts which we cannot dare talk about and we do not like that we have them or talk about them. He said:Have you experienced that? They replied: yes. He said : that is clear faith

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid