Musnad Ahmad 1034:23

Isma'il ibn Ibrahim narrated to us, from Layth, from Bilal, from Shutayr ibn Shakl, and from Silah ibn Zufar, and from Sulayk ibn Mash'al al-Ghatafani, they said: Hudhayfah came out to us while we were talking, and he said: "You are speaking words that we used to consider hypocrisy during the time of the Messenger of Allah, may Allah bless him and grant him peace."