It was narrated that Sahl bin Sa’d said:

“We were with the Messenger of Allah (ﷺ) in Dhul-Hulaifah, when we saw a dead sheep lifting its leg (because of bloating). He said: ‘Don’t you think this is worthless to its owner? By the One in Whose hand is my soul, this world is more worthless to Allah than this (dead sheep) is to its owner. If this world was worth the wing of a mosquito to Allah, the disbeliever would not have a drop to drink from it.’”

~Sunan Ibn Majah

Shaykh albani classed it as saheeh in as-saheehah 2482, 686