Musnad Abu Ya'la al-Mawsili 112:28

Musa ibn Muhammad ibn Hayyan narrated to us, al-Dahhak ibn Makhlad narrated to us, from al-Mubarak ibn Fudalah, from al-Hasan, from Anas: That the Prophet, peace and blessings of Allah be upon him, was upon a bed, and it was woven with strips. He said: Then some of his companions entered upon him. He said: And Umar entered, so the Prophet, peace and blessings of Allah be upon him, shifted, and behold, the strips had left an impression on his side. Umar wept and said: "By Allah, we know that you are more honorable to Allah than Chosroes and Caesar, yet they revel in what they revel in." He said: "Are you not pleased that they have the worldly life and we have the Hereafter?" He said: "Yes." He said: Then he remained silent.