The Prophet ﷺ said, "They now realize that what I used to tell them was the truth. "And Allah said, 'Verily! You cannot make the dead to hear (i.e. benefit them, and similarly the disbelievers) nor can you make the deaf hear. (27.80).
قَالَ النَّبِيُّ ﷺ إِنَّهُمْ لَيَعْلَمُونَ الآنَ أَنَّ مَا كُنْتُ أَقُولُ حَقٌّ وَقَدْ قَالَ اللَّهُ تَعَالَى {إِنَّكَ لاَ تُسْمِعُ الْمَوْتَى}
[Machine] The Prophet ﷺ said, "Verily, they now know that what I used to say to them in the world was the truth." And Allah Almighty said to His Prophet ﷺ, "Indeed, you do not make the dead hear, nor do you make the deaf hear the call when they turn their backs in retreat." [Surah An-Naml, verse 80]
قَالَ رَسُولُ اللَّهِ ﷺ إِنَّهُمْ لَيَعْلَمُونَ الْآنَ أَنَّ الَّذِي كُنْتُ أَقُولُ لَهُمْ فِي الدُّنْيَا حَقٌّ وَقَالَ اللَّهُ تَعَالَى لِنَبِيِّهِ ﷺ {إِنَّكَ لَا تُسْمِعُ الْمَوْتَى وَلَا تُسْمِعُ الصُّمَّ الدُّعَاءَ إِذَا وَلَّوْا مُدْبِرِينَ} [النمل 80]