Musnad Abu Ya'la al-Mawsili 140:25

Abu Khaythama narrated to us, Rawh ibn ‘Ubadah narrated to us, Musa ibn ‘Ubaydah narrated to us, Yazid al-Raqashi narrated to me, from Anas, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "There is no plot of land upon which Allah is remembered with prayer or dhikr, except that it rejoices at that to its furthest extent from the seven earths, and it boasts over the plots of land surrounding it. And there is no servant who stands in a wilderness of the earth intending to pray, except that the earth adorns itself for him."