Ibn Majaah (738) narrated from Jaabir ibn ‘Abd-Allaah that the Messenger of Allaah (peace and blessings of Allaah be upon him) said:
“Whoever builds a mosque for the sake of Allaah, like a sparrow’s nest or even smaller, Allaah will build for him a house in Paradise.”
Classed as saheeh by al-Albaani.
The qataah (translated here as sparrow) is a small bird, and its nest is the place where it settles and lays its eggs. The qataah is singled out for mention here because it does not lay its eggs in a tree or at the top of a mountain, rather it makes its nest on the ground, unlike other birds; hence it is likened to a mosque/masjid.
The scholars said: This is mentioned by way of exaggeration, i.e., even if the mosque is as small as that.
Sumber: Salaf-Stories.blogspot.com
