Meaning of traveling in the Hadith

Q 8: The Messenger of Allah (peace be upon him) said: Do not set out on a journey but to three Masjids (mosques): Al-Masjid Al-Haram (the Sacred Mosque in Makkah), this Masjid of mine (the Prophet's Mosque in Madinah) and Al-Masjid Al-Aqsa (the Aqsa Mosque in Jerusalem). What is the meaning of this Hadith? How should one set out on a journey? (Part No. 2; Page No. 285

A: The meaning of the Hadith is that it is not permissible to set out on a journey for the purpose of `Ibadah (worship) of Allah (Exalted be He), such as offering Salah (Prayer), saying Du`a' (supplication), or reciting the Qur'an except to these three places: Al-Masjid Al-Haram, Al-Masjid Al-Nabawy, and Al-Masjid Al-Aqsa. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.