From Sahih Bukhari (Hadith 6442):
Narrated `Abdullah:The Prophet (ﷺ) said, "Who among you considers the wealth of his heirs dearer to him than his own wealth?" They replied, "O Allah's Messenger (ﷺ)! There is none among us but loves his own wealth more." The Prophet (ﷺ) said, "So his wealth is whatever he spends (in Allah's Cause) during his life (on good deeds) while the wealth of his heirs is whatever he leaves after his death
Reference: Bukhari 6442