From Sahih Bukhari (Hadith 2795):
Narrated Anas bin Malik: The Prophet (ﷺ) said, "Nobody who dies and finds good from Allah (in the Hereafter) would wish to come back to this world even if he were given the whole world and whatever is in it, except the martyr who, on seeing the superiority of martyrdom, would like to come back to the world and get killed again (in Allah's Cause)
Reference: Bukhari 2795