Prayer at Night (Tahajjud)
Bukhari :: Book 2 :: Volume 21 :: Hadith 288
Narrated Qaza'a Maula:
(freed slave of) Ziyad: I heard Abu Said Al-khudri narrating four things from the Prophet and I appreciated them very much. He said, conveying the words of the Prophet.
(1) "A woman should not go on a two day journey except with her husband or a Dhi-Mahram.
(2) No fasting is permissible on two days: 'Id-ul-Fitr and 'Id-ul-Adha.
(3) No prayer after two prayers, i.e. after the Fajr prayer till the sunrises and after the 'Asr prayer till the sun sets.
(4) Do not prepare yourself for a journey except to three Mosques, i.e. Al-Masjid-AI-Haram, the Mosque of Aqsa (Jerusalem) and my Mosque."