It is reported that Jubayr b. Nufayr said:
I entered upon Abū Al-Dardāʾ – Allāh be pleased with him – at his home in Ḥims and found him standing in prayer at his place of prayer. When he sat for tashahhud he started to seek protection with Allāh from al-nifāq (hypocrisy). So when he had finished praying, I said “May Allāh forgive you o Abū Al-Dardāʾ, what have you got to do with nifāq?” He said, “O Allāh forgive!”, three times, and replied, “Who can feel secure from trial, who can feel secure from trial? By Allāh, a man can be tested with fitnah in a single hour and turn away from his religion.”
Al-Bayhaqī, Shuʿab Al-Īmān 1:857.