It is narrated from Sayyiduna Abu Qirsafah (may Allah be pleased with him) that he heard the Prophet (peace and blessings be upon him) say: "Build mosques and remove the rubbish from them. Whoever builds a mosque for Allah, Allah will build for him a house in Paradise." A man said: O Messenger of Allah, and these mosques that are built along the road (do they have the same ruling)? He said: "Yes, and removing the rubbish from them is the dowry of the wide-eyed maidens of Paradise (hur al-in)."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2508