Sahih Bukhari Volume 4, Book 56, Hadith 3007

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا سُفْيَانُ، عَنْ عَمْرٍو، عَنْ أَبِي مَعْبَدٍ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ أَنَّهُ سَمِعَ النَّبِيَّ صلى الله عليه وسلم يَقُولُ ‏"‏ لاَ يَخْلُوَنَّ رَجُلٌ بِامْرَأَةٍ، وَلاَ تُسَافِرَنَّ امْرَأَةٌ إِلاَّ وَمَعَهَا مَحْرَمٌ ‏"‏‏.‏ فَقَامَ رَجُلٌ فَقَالَ يَا رَسُولَ اللَّهِ، اكْتُتِبْتُ فِي غَزْوَةِ كَذَا وَكَذَا، وَخَرَجَتِ امْرَأَتِي حَاجَّةً‏.‏ قَالَ ‏"‏ اذْهَبْ فَحُجَّ مَعَ امْرَأَتِكَ ‏"‏‏

Narrated By Ibn Abbas : That he heard the Prophet saying, "It is not permissible for a man to be alone with a woman, and no lady should travel except with a Muhram (i.e. her husband or a person whom she cannot marry in any case for ever; e.g. her father, brother, etc.)." Then a man got up and said, "O Allah's Apostle! I have enlisted in the army for such-and-such Ghazwa and my wife is proceeding for Hajj." Allah's Apostle said, "Go, and perform the Hajj with your wife."