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Narrated Abu Dhaar:

I said, "O Allah's Apostle! 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."
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 ‏"‏‏.‏

Classification

Sahih (Authentic)

References

• Sahih al-Bukhari, 3425
• Sahih al-Bukhari, Vol. 4, Book of Prophets, Hadith 636
• Sahih al-Bukhari, Book of Prophets, Hadith 636