Sahih al-Bukhari 3425
Sahih al-Bukhari · Book 60: Prophets · The Statement of Allah Taa'la: "And to Dawud, We gave Sulaiman (for a son). How excellent (a) slave he was ever oft-returning in repentance (to us)" (38.30)
Narrated Abu Dhaar:
حَدَّثَنِي عُمَرُ بْنُ حَفْصٍ ، حَدَّثَنَا أَبِي ، حَدَّثَنَا الأَعْمَشُ ، حَدَّثَنَا إِبْرَاهِيمُ التَّيْمِيُّ ، عَنْ أَبِيهِ ، عَنْ أَبِي ذَرٍّ ـ رضى الله عنه ـ قَالَ قُلْتُ يَا رَسُولَ اللَّهِ. أَىُّ مَسْجِدٍ وُضِعَ أَوَّلُ قَالَ " الْمَسْجِدُ الْحَرَامُ ". قُلْتُ ثُمَّ أَىٌّ قَالَ " ثُمَّ الْمَسْجِدُ الأَقْصَى ". قُلْتُ كَمْ كَانَ بَيْنَهُمَا قَالَ " أَرْبَعُونَ ". ثُمَّ قَالَ " حَيْثُمَا أَدْرَكَتْكَ الصَّلاَةُ فَصَلِّ، وَالأَرْضُ لَكَ مَسْجِدٌ " .
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."