Sunan Abi Dawud 1727
سنن أبي داود#1727SahihIbn `Umr reported the Prophet (SWAS) as saying :A woman must not make a journey of three days unless she is accompanied by a man who is within the prohibited degree
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih Bukhari (1087) Sahih Muslim (1338)
In-book reference: 11:7