Sahih al-Bukhari — Hadith #1087

Musaddad narrated to us, he said, Yahya narrated to us, on the authority of Ubayd Allah, on the authority of Nafi’, on the authority of Ibn Umar - may God be pleased with them both - on the authority of the Prophet, may God’s prayers and peace be upon him, who said: “A woman should not travel.” “Three, except with a mahram.” Ahmad followed it, on the authority of Ibn al-Mubarak, on the authority of Ubayd Allah, on the authority of Nafi’, on the authority of Ibn Umar, on the authority of The Prophet, may God bless him and grant him peace.