Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Zaid bin Khalid that the Messenger of Allah, peace and blessings be upon him, said: If I did not fear hardship for my ummah, I would have ordered them to use the miswak before every prayer. Hazrat Zaid bin Khalid used to place the miswak on his ear where a scribe keeps his pen. When he stood up for prayer, he would use the miswak and then place it back there.