Sunan an-Nasa'i, Hadith 736 ⓘ
It was narrated that Jabir bin 'Abdullah said: "The Messenger of Allah said: 'The earth has been made for me a place of prostration and a means of purification, so wherever a man of my Ummah is when the time for prayer comes, let him pray.'"
أَخْبَرَنَا الْحَسَنُ بْنُ إِسْمَاعِيلَ بْنِ سُلَيْمَانَ، قَالَ حَدَّثَنَا هُشَيْمٌ، قَالَ حَدَّثَنَا سَيَّارٌ، عَنْ يَزِيدَ الْفَقِيرِ، عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " جُعِلَتْ لِيَ الأَرْضُ مَسْجِدًا وَطَهُورًا أَيْنَمَا أَدْرَكَ رَجُلٌ مِنْ أُمَّتِي الصَّلاَةَ صَلَّى " .
also referenced under: Book 8, Hadith 49 (In-Book) & Volume 1, Book 8, Hadith 737 (DarusSalam)