Musannaf Ibn Abi Shayba 33:79

Abu Mu'awiyah narrated to us, from Layth, from Mujahid, from Ibn Umar, who said: The Prophet, peace and blessings of Allah be upon him, took hold of my hand or some part of my body and said to me: "O Abdullah bin Umar, be in this world as if you were a stranger or a passerby, and count yourself among the people of the graves." Mujahid said: And Abdullah bin Umar said to me: "When you reach the morning, do not speak to yourself of the evening, and when you reach the evening, do not speak to yourself of the morning. Take from your life before your death, and from your health before your sickness, for you do not know what your name will be tomorrow."