Hadith 517830
Chapter 54: General Subjects - كتاب الاستئذان
وَحَدَّثَنِي مَالِكٌ، عَنْ سَعِيدِ بْنِ أَبِي سَعِيدٍ الْمَقْبُرِيِّ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " لاَ يَحِلُّ لاِمْرَأَةٍ تُؤْمِنُ بِاللَّهِ وَالْيَوْمِ الآخَرِ تُسَافِرُ مَسِيرَةَ يَوْمٍ وَلَيْلَةٍ إِلاَّ مَعَ ذِي مَحْرَمٍ مِنْهَا " .
Malik related to me from Said ibn Abi Said al-Maqburi from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, "It is not halal for a woman who believes in Allah and the Last Day to travel the distance of a day and night without a man who is her mahram."
Reference Muwatta Malik 517830
USC-MSA web (English) reference : Book 54, Hadith 37