"The Messenger of Allah said: 'Whoever removes something harmful from the mosque, Allah will build for him a house in Paradise.'"
Sunan Ibn Majah Book 4, Hadith 23
← Previous Hadith "One of my paternal uncles made some food for the Prophet and said to the Prophet: 'I would like you to eat and perform prayer in my house.' So he went to him, and in his house there was one of these Fahl. He ordered that a corner be swept and water sprinkled in it, then he performed prayer and we prayed with him.'" (Sahih)Abu 'Abdullah bin Majah said: A Fahl is a mat that has become black (through use).

Sunan Ibn Majah Book 4, Hadith 22 Next Hadith → The Messenger of Allah commanded that mosque to be built in (Ad-Dur) villages, and that they be purified and perfumed.

Sunan Ibn Majah Book 4, Hadith 24