Hadith 7

Sahih Bukhari

Book 18: Shortening the Prayers (At-Taqseer)

Chapter 4

The length of the journey that makes it permissible to offer a shortened prayer?

باب فِي كَمْ يَقْصُرُ الصَّلاَةَ

The Prophet ﷺ called a journey of one day and one night as travelling. Ibn 'Umar, Ibn 'Abbas رضي الله عنهما used to shorten the Salat and stop fasting in a journey of four Burud, i.e. sixteen Farsakh (distance of 3 miles equals one Farsakh). ​​
وَسَمَّى النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَوْمًا وَلَيْلَةً سَفَرًا. وَكَانَ ابْنُ عُمَرَ وَابْنُ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمْ يَقْصُرَانِ وَيُفْطِرَانِ فِي أَرْبَعَةِ بُرُدٍ وَهْيَ سِتَّةَ عَشَرَ فَرْسَخًا.
Sahih al-Bukhari 1086
حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ الْحَنْظَلِيُّ، قَالَ قُلْتُ لأَبِي أُسَامَةَ حَدَّثَكُمْ عُبَيْدُ اللَّهِ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ ‏ ‏‏.‏
"‏ لاَ تُسَافِرِ الْمَرْأَةُ ثَلاَثَةَ أَيَّامٍ إِلاَّ مَعَ ذِي مَحْرَمٍ ‏"
Ibn `Umar:

The Prophet (ﷺ) said, "A woman should not travel for more than three days except with a Dhi-Mahram (i.e. a male with whom she cannot marry at all, e.g. her brother, father, grandfather, etc.) or her own husband.)"