It is narrated from Sayyiduna Zaid (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: If I did not fear hardship for my ummah, I would have commanded them to use the miswak at every prayer time. For this reason, Sayyiduna Zaid bin Khalid (may Allah be pleased with him) used to keep the miswak on his ear just as a scribe keeps his pen, and when he stood for prayer, he would use the miswak.