ENOfficial
‘A’isha reported God’s messenger as saying, “Do not revile the dead, for they have come to what they have sent before them.” Bukhari transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لَا تَسُبُّوا الْأَمْوَاتَ فَإِنَّهُمْ قَدْ أَفْضَوْا إِلَى مَا قدمُوا» رَوَاهُ البُخَارِيّ
sunnah.com