Sahih Bukhari
Sahih Bukhari Volume 002, Book 020, Hadith Number 193.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 20. Shortening The Prayers (At-Taqseer)
Narated By Ibn'Umar : The Prophet said, "A woman should not travel for more than three days except with a Dhi-Mahram."