Sunan an-Nasa'i, Volume 1, Book 8, Hadith 701 (DarusSalam) ⓘ
It was narrated from Abu Hurairah that the Messenger of Allah said: "Mounts are not saddled for except to (travel to) three Masjids: Al-Masjid Al-Haram, this Masjid of mine, and Al-Masjid Al-Aqsa."
أَخْبَرَنَا مُحَمَّدُ بْنُ مَنْصُورٍ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنِ الزُّهْرِيِّ، عَنْ سَعِيدٍ، عَنْ أَبِي هُرَيْرَةَ، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ " لاَ تُشَدُّ الرِّحَالُ إِلاَّ إِلَى ثَلاَثَةِ مَسَاجِدَ مَسْجِدِ الْحَرَامِ وَمَسْجِدِي هَذَا وَمَسْجِدِ الأَقْصَى " .
also referenced under: Hadith 700 (Reference) & Book 8, Hadith 13 (In-Book)