Sahih Muslim | Book 9 | Hadith Number 3508

Narrated by
What makes you weep? I said: Messenger of Allah, the Khusrau and the Ceasars (spend their lives in) the midst of (luxuries), whereas you being Allah's Messenger (are leading your life in this poverty). Thereupon Allah's Messenger (may peace be upon him) said:Don't you like that they should have riches of their world, and you have the Hereafter.