Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "Saddles are not to be fastened (for a journey) except to three mosques: the House of Allah, i.e. al-Masjid al-Haram, (2) al-Masjid al-Aqsa, (3) my mosque, i.e. the Prophet's Mosque."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 10263