From Sahih Bukhari (Hadith 2817):
Narrated Anas bin Malik: The Prophet (ﷺ) said, "Nobody who enters Paradise likes to go back to the world even if he got everything on the earth, except a Mujahid who wishes to return to the world so that he may be martyred ten times because of the dignity he receives (from Allah)
Reference: Bukhari 2817