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””””””"
SahihSahihSahihBook 4 · Hadith 19