Sahih Muslim Book - 5, Hadith - 1162

حَدَّثَنِى عَلِىُّ بْنُ حُجْرٍ السَّعْدِىُّ أَخْبَرَنَا عَلِىُّ بْنُ مُسْهِرٍ حَدَّثَنَا الأَعْمَشُ عَنْ إِبْرَاهِيمَ بْنِ يَزِيدَ التَّيْمِىِّ قَالَ كُنْتُ أَقْرَأُ عَلَى أَبِى الْقُرْآنَ فِى السُّدَّةِ فَإِذَا قَرَأْتُ السَّجْدَةَ سَجَدَ فَقُلْتُ لَهُ يَا أَبَتِ أَتَسْجُدُ فِى الطَّرِيقِ قَالَ إِنِّى سَمِعْتُ أَبَا ذَرٍّ يَقُولُ سَأَلْتُ رَسُولَ اللَّهِ -صلى الله عليه وسلم- عَنْ أَوَّلِ مَسْجِدٍ وُضِعَ فِى الأَرْضِ قَالَ « الْمَسْجِدُ الْحَرَامُ ». قُلْتُ ثُمَّ أَىٌّ قَالَ « الْمَسْجِدُ الأَقْصَى ». قُلْتُ كَمْ بَيْنَهُمَا قَالَ « أَرْبَعُونَ عَامًا ثُمَّ الأَرْضُ لَكَ مَسْجِدٌ فَحَيْثُمَا أَدْرَكَتْكَ الصَّلاَةُ فَصَلِّ ».

Ibrahim bin Yazid At-Taimi said: I used to recite the Qur'an to my father at As-Suddah of the Masjid, and when I recited a verse where prostration is required, he would prostrate. I said to him: 'O my father, are you prostrating in the street?' He said: 'I heard Abu Dharr say: "I asked the Messenger of Allah (s.a.w) about the first Masjid to be built on earth. He said: 'Al-Masjid Al-Haram.' I said: 'Then which?' He said: 'Al-Masjid Al-Aqsa.' I said: 'How long was there between the two?' He said: 'Forty years. But the earth is a Masjid for you, so wherever you are when the time for prayer is due, then pray."'