The Book of Shortening the Prayer When Traveling
15/3. Chapter:
The length of stay during which prayers may be shortened
Sunan an-Nasai
أَخْبَرَنَا حُمَيْدُ بْنُ مَسْعَدَةَ، قَالَ حَدَّثَنَا يَزِيدُ، قَالَ أَنْبَأَنَا يَحْيَى بْنُ أَبِي إِسْحَاقَ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ خَرَجْنَا مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم مِنَ الْمَدِينَةِ إِلَى مَكَّةَ فَكَانَ يُصَلِّي بِنَا رَكْعَتَيْنِ حَتَّى رَجَعْنَا . قُلْتُ هَلْ أَقَامَ بِمَكَّةَ قَالَ نَعَمْ أَقَمْنَا بِهَا عَشْرًا .
It was narrated from Yahya bin Abi Ishaq that : Anas bin Malik said: " We went out with the Messenger of Allah (ﷺ) from Al-Madinah to Makkah and he used to lead us in praying two rak'ahs until we came back." I (Yahya) said: "Did he stay in Makkah?" He (Anas) said: "Yes, we stayed there for ten days."
Reference : Sunan an-Nasa'i 1452In-book reference : Book 15, Hadith 20English translation : Vol. 2, Book 15, Hadith 1453