(74) باب سَفَرِ الْمَرْأَةِ مَعَ مَحْرَمٍ إِلَى حَجٍّ وَغَيْرِهِ
Abu Sa'id Khudri (Allah be pleased with him) reported Allah's Apostle (ﷺ) as saying:
A woman should not set out on a journey extending beyond three nights but with a Mahram.
Reference: Sahih Muslim 827 g
In-book reference: Book 15, Hadith 468
USC-MSA web (English) reference(deprecated numbering scheme): Book 7, Hadith 3102