(40) بَابُ قَوْلِ اللَّهِ تَعَالَى: {وَوَهَبْنَا لِدَاوُدَ سُلَيْمَانَ نِعْمَ الْعَبْدُ إِنَّهُ أَوَّابٌ}
Narrated Abu Dhaar:
I said, "O Allah's Messenger (ﷺ)! Which mosque was built first?" He replied, "Al-Masjid-ul-Haram." I asked, "Which (was built) next?" He replied, "Al-Masjid-ul-Aqs-a (i.e. Jerusalem)." I asked, "What was the period in between them?" He replied, "Forty (years)." He then added, "Wherever the time for the prayer comes upon you, perform the prayer, for all the earth is a place of worshipping for you."
Reference: Sahih al-Bukhari 3425
In-book reference: Book 60, Hadith 97
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 55, Hadith 636