The Prophet said: "Beware of An-Na'i, for indeed announcing one's death is from the deeds of Jahliyyah."  

عَنِ النَّبِيِّ ﷺ قَالَ إِيَّاكُمْ وَالنَّعْىَ فَإِنَّ النَّعْىَ مِنْ عَمَلِ الْجَاهِلِيَّةِ قَالَ عَبْدُ اللَّهِ وَالنَّعْىُ أَذَانٌ بِالْمَيِّتِ وَفِي الْبَابِ عَنْ حُذَيْفَةَ  

(from the Prophet) similar (to no. 984), but he did not narrate it in Marfu form, and he did not mention in it: "An-Na'i is announcing of one's death."  

عَنْ عَبْدِ اللَّهِ نَحْوَهُ وَلَمْ يَرْفَعْهُ وَلَمْ يَذْكُرْ فِيهِ وَالنَّعْىُ أَذَانٌ بِالْمَيِّتِ  

Hudaifah (bin Al-Yaman) said: "When I do not announce about me to anyone, indeed I fear that it would be An-Na'i, and I heard the Messenger of Allah prohibiting from An-Na'i."  

إِذَا مِتُّ فَلاَ تُؤْذِنُوا بِي أَحَدًا إِنِّي أَخَافُ أَنْ يَكُونَ نَعْيًا فَإِنِّي سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَنْهَى عَنِ النَّعْىِ هَذَا حَدِيثٌ حَسَنٌ