(1) باب الْكَرَاهِيَةِ فِي تَأْخِيرِ الْوَصِيَّةِ
It was narrated that 'Abdullah said:
"The Messenger of Allah said: 'For whom among you is the wealth of his heirs dearer to him than his own wealth?' They said: 'O Messenger of Allah, there is no one among us for whom his own wealth is not dearer to him than the wealth of his heirs.' The Messenger of Allah said: 'Know that there is no one among you for whom the wealth of his heirs is not dearer than his own wealth. Your wealth is that which you have sent on ahead, and the wealth of your heirs is that which you have kept.'"
Reference: Sunan an-Nasa'i 3612
In-book reference: Book 30, Hadith 2
English translation: Vol. 4, Book 30, Hadith 3642