Sahih Bukhari Volume 9, Book 83, Hadith Number 26.

Narrated By Abu Huraira : That he heard Allah’s Apostle saying, “We (Muslims) are the last (to come) but (will be) the foremost (on the Day of Resurrection).” And added, “If someone is peeping (looking secretly) into your house without your permission, and you throw a stone at him and destroy his eyes, there will be no blame on you.”