Sahih Bukhari Volume 7, Book 62, Hadith Number 154.

Narrated By Abu Huraira : While we were sitting with Allah’s Apostle, (he) Allah’s Apostle said, “While I was sleeping, I saw a woman performing ablution beside a palace. I asked, “Whose palace is this?’ It was said, ‘This palace belongs to ‘Umar.’ Then I remembered his sense of Ghira and returned.” On that ‘Umar started weeping in that gathering and said, “O Allah’s Apostle! How dare I think of my self-respect being offended by you?”