It is narrated from Hazrat Umm Habibah (may Allah be pleased with her) that I heard the Prophet (peace and blessings of Allah be upon him) saying: If I had not feared hardship for my Ummah, I would have commanded them to use the miswak at every prayer time "when they perform ablution."
Hadith Referenceمسند احمد / من مسند القبائل / 27415
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد ضعيف لجهالة أبى الجراح