Sunan an-Nasa'i 736
سنن النسائي#736Sahihأَخْبَرَنَا 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 " .
It was narrated that Jabir bin 'Abdullah said:"The Messenger of Allah (ﷺ) 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
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 8:49