It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "I was commanded so much to use the miswak that I began to think that soon a verse of the Noble Qur'an would be revealed about it."
Hadith Referenceالفتح الربانی / كتاب الطهارة / 553