Supplications of the terminally ill patient
اَللّٰهُـمَّ اغْفِـرْلِيْ وَارْحَمْـنِيْ وَأَلْحِقْـنِيْ بِالرَّفِيْقِ الْأَعْلٰى
O Allah, forgive me and have mercy upon me and join me with the highest companions (in Paradise).
References
[Sahih Bukhari - 5674]