"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.'" (Using translation from Nasāʾī 736)  

قَالَ لي رَسُولُ اللهِ ﷺ «جُعِلَتِ لِيَ الْأَرْضُ مَسْجِدًا وَطَهُورًا فَأَيْنَمَا أَدْرَكَ رَجُلًا مِنْ أُمَّتِي الصَّلَاةُ صَلَّى»