It is narrated from Sayyiduna Mu'awiyah (may Allah be pleased with him); he said: "The Messenger of Allah (peace and blessings be upon him) commanded me not to go to my wife on the first night of the new moon, not to perform ablution with water from a copper vessel, and to use the tooth-stick (miswak) whenever I rise from my sleep."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16861