Wathila b. al-Asqa‘ said God’s messenger led them in prayer over a Muslim and he heard him say, “O God, so and so son of so and so is in Thy protection and in Thy nearer presence, so guard him from the trial in the grave and the punishment in hell. Thou art faithful and true. O God, forgive him and show him mercy. Thou art the forgiving and the merciful One.” Abu Dawud and Ibn Majah transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ وَاثِلَةَ بْنِ الْأَسْقَعِ قَالَ: صَلَّى بِنَا رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَلَى رَجُلٍ مِنَ الْمُسْلِمِينَ فَسَمِعْتُهُ يَقُولُ: «اللَّهُمَّ إِنَّ فُلَانَ بْنَ فُلَانٍ فِي ذِمَّتِكَ وَحَبْلِ جِوَارِكَ فَقِهِ مِنْ فِتْنَةِ الْقَبْرِ وَعَذَابِ النَّارِ وَأَنْتَ أَهْلُ الْوَفَاءِ وَالْحَقِّ اللَّهُمَّ اغْفِرْ لَهُ وَارْحَمْهُ إِنَّكَ أَنْتَ الْغَفُورُ الرَّحِيمُ» . رَوَاهُ أَبُو دَاوُدَ وَابْن مَاجَه
sunnah.com