`Abdullah bin `Umar (May Allah be pleased with tehm) reported: The Prophet (Peace Be Upon Him) said, "It was shown to me in my dream that I was cleaning my teeth with a Miswak and two men came to me, one being older than the other. I gave the Miswak to the younger one, but I was asked to give it to the older, which I did". [Al-Bukhari and Muslim]

Commentary: We learn two things from this Hadith. First, one can use Miswak of another person with his permission. Second, the eldest people should have precedence over others in every matter, except in cases where a younger one excels them in some merit.