عَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: فُرِضَتِ الصَّلَاةُ رَكْعَتَيْنِ فَزَادَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ فِي صَلَاةِ الْحَضَرِ وَتَرَكَ صَلَاةَ السَّفَرِ فِي نَحْوِهَا
It is narrated from Sayyida Aisha (may Allah be pleased with her), she says: The prayer was made obligatory as two rak'ahs, then the Messenger of Allah (peace and blessings be upon him) increased the prayer in residence, and left the travel prayer as it was.