Sayyiduna Abu al-Darda', Abu Umamah and Wathilah (may Allah be pleased with them) narrated: We heard the Messenger of Allah (peace and blessings be upon him) saying: "Keep away from your mosques your children, your insane, your disputes, your raised voices, the drawing of swords and the carrying out of the legal punishments (hudud); perfume them with incense once every seven days, and set up places for ablution at the doors of your mosques."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7570