It was narrated from Mahmood bin Labeed That `Uthman (رضي الله عنه) wanted to build (an extension to) the mosque of Madinah, but the people objected to that and wanted to leave it as it was. `Uthman (رضي الله عنه) said:
I heard the Messenger of Allah( ﷺ) say: `Whoever builds a mosque for the sake of Allah, Allah will build for him a house like it in Paradise.`