(7) باب أَىُّ مَسْجِدٍ وُضِعَ أَوَّلُ
It was narrated that Abu Dharr Al-Ghifari said:
"I said: 'O Messenger of Allah! Which mosque was built first?' He said: 'Al-Masjid Al-Haram (in Makkah).' I said: 'Then which?' He said: 'then Al-Masjid Al-Aqsa (in Jerusalem).' I said: 'How many years between them?' He said: 'Forty years, but the whole earth is a mosque for you, so pray wherever you are when the time for prayer comes.'"
Reference: Sunan Ibn Majah 753
In-book reference: Book 4, Hadith 19
English translation: Vol. 1, Book 4, Hadith 753