Yahya related to me from Malik from Yahya ibn Said that Said ibnal-Musayyab used to say, "Whoever prays on waterless, desolate land -an angel prays on his right and an angel prays on his left. When hecalls both the adhan and the iqama for the prayer, or calls out theiqama, angels like mountains pray behind him."
App reference: Book 3, Hadith 14
USC-MSA web (English) reference: Book 3, Hadith 14
Arabic reference: Book 3, Hadith 160