عَنِ ابْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ: ((لَا تُسَافِرُ الْمَرْأَةُ ثَلَاثًا إِلَّا وَمَعَهَا ذُو مَحْرَمٍ))
It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: No woman should travel for three days except with a mahram relative.