Musannaf Ibn Abi Shayba 3:778

Abu Bakr narrated to us, he said: Abu Mu'awiyah narrated to us, from al-A'mash, from Ibrahim al-Taymi, from his father, from Abu Dharr, who said: "Whoever builds a mosque for Allah, even if it is like the nest of a sandgrouse, Allah will build a house for him in Paradise."