Jami` at-Tirmidhi 974
جامع الترمذي#974SahihIbn Umar narrated that:The Messenger of Allah said: "A Muslim man has no right to spend two nights while he has something to will, except while his will is recorded with him
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 10:10