Sahih Bukhari Volume 7, Book 65, Hadith Number 352.

Narrated By Abu ‘Uthman : I was a guest of Abu Huraira for seven days. Abu Huraira, his wife and his slave used to get up and remain awake for one-third of the night by turns. Each would offer the night prayer and then awaken the other. I heard Abu Huraira saying, “Allah’s Apostle distributed dates among his companions and my share was seven dates, one of which was a Hashafa (a date which dried on the tree before it was fully ripe).