Hadithcore
Bulugh al-Maram, 556

Hudhaifah (RAA) narrated that the Messenger of Allah (ﷺ) used to prohibit the announcement of anyone’s death. Related by Ahmad and At-Tirmidhi, who rendered it Hasan.

وَعَنْ حُذَيْفَةَ ‏- رضى الله عنه ‏- { أَنَّ اَلنَّبِيَّ ‏- صلى الله عليه وسلم ‏-كَانَ يَنْهَى عَنِ اَلنَّعْيِ } رَوَاهُ أَحْمَدُ, وَاَلتِّرْمِذِيُّ وَحَسَّنَهُ [1]‏ .‏

References2 variants
In-Book Reference
Book 3, Hadith 24
English Reference
Book 3, Hadith 580