مُسْنَدُ أَحْمَدَ
Musnad Ahmad 4180
Musnad of Abdullah bin Mas'ood
It was narrated from 'Abdullah that The Prophet (ﷺ) said: "What do I have to do with this world? Rather the likeness of me and this world is that of a rider who slept in the shade of a tree on a hot summer day, then he moved on and left it behind."
Musnad Ahmad 4208Saheeh; this is a hasan isnad]