Maliks Muwatta Book 3, Hadith Number 14.

Yahya related to me from Malik from Yahya ibn Said that Said ibn al-Musayyab used to say, “Whoever prays on waterless, desolate land – an angel prays on his right and an angel prays on his left. When he calls both the adhan and the iqama for the prayer, or calls out the iqama, angels like mountains pray behind him.”