Volume 4 · Book 52 · Hadith 265
Narrated Al-Bara bin Azib: Allah's Apostle sent a group of the Ansar to Abu Rafi. Abdullah bin Atik entered his house at night and killed him while he was sleeping.
— Sahih Bukhari, Volume 4, Book 52: Fighting for the Cause of Allah (Jihaad), Hadith #265