When a traveller leaves his original place, he can shorten his Salat (prayer)
باب يَقْصُرُ إِذَا خَرَجَ مِنْ مَوْضِعِهِ
Sahih al-Bukhari, Book of Shortening the Prayers (At-Taqseer)(view book)
Narrated Anas bin Malik :
offered four Rakat of Zuhr prayer with the Prophet ﷺ at Medina and two Rakat at Dhul-Hulaifa. (i.e. shortened the 'Asr prayer).
حَدَّثَنَا أَبُو نُعَيْمٍ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ مُحَمَّدِ بْنِ الْمُنْكَدِرِ، وَإِبْرَاهِيمَ بْنِ مَيْسَرَةَ، عَنْ أَنَسٍ ـ رضى الله عنه ـ قَالَ صَلَّيْتُ الظُّهْرَ مَعَ النَّبِيِّ ﷺ بِالْمَدِينَةِ أَرْبَعًا، وَبِذِي الْحُلَيْفَةِ رَكْعَتَيْنِ.
Classification
Narrated 'Aisha:
"When the prayers were first enjoined they were of two Rakat each. Later the prayer in a journey was kept as it was but the prayers for non-travellers were completed." Az-Zuhri said, "I asked 'Urwa what made Aisha pray the full prayers (in journey)." He replied, "She did the same as 'Uthman did."
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنِ الزُّهْرِيِّ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتِ الصَّلاَةُ أَوَّلُ مَا فُرِضَتْ رَكْعَتَيْنِ فَأُقِرَّتْ صَلاَةُ السَّفَرِ، وَأُتِمَّتْ صَلاَةُ الْحَضَرِ. قَالَ الزُّهْرِيُّ فَقُلْتُ لِعُرْوَةَ مَا بَالُ عَائِشَةَ تُتِمُّ قَالَ تَأَوَّلَتْ مَا تَأَوَّلَ عُثْمَانُ.