اللَّهُمَّ إِنِّي أَسْأَلُكَ الْجَنَّةَ وَأَعُوذُ بِكَ مِنَ النَّارِ
Allahumma inni as'alukal-Jannah wa a'udhu bika minan-Nar
O Allah, I ask You for Paradise and seek refuge from the Fire.
The simplest and most direct akhirah du'a. Two requests that distill all of Islamic eschatology into one sentence: get me into Jannah, keep me out of the Fire. The Prophet ﷺ said that whoever asks for Paradise three times, Paradise says: "O Allah, enter him into Paradise." And whoever seeks refuge from the Fire three times, the Fire says: "O Allah, protect him from me." Say it. Three times. Now.
Related Du'as
اللَّهُمَّ اغْفِرْ لَهُ وَارْحَمْهُ وَأَدْخِلْهُ الْجَنَّةَ وَأَعِذْهُ مِنْ عَذَابِ الْقَبْرِ
O Allah, forgive him, have mercy on him, admit him to Paradise, and protect him from the punishment of the grave.
Sahihاللَّهُمَّ اغْفِرْ لِحَيِّنَا وَمَيِّتِنَا وَصَغِيرِنَا وَكَبِيرِنَا وَذَكَرِنَا وَأُنْثَانَا وَشَاهِدِنَا وَغَائِبِنَا
O Allah, forgive our living and our dead, our young and our old, our males and our females, our present and our absent.
Sahihاللَّهُمَّ اغْفِرْ لَهُ وَارْفَعْ دَرَجَتَهُ فِي الْمَهْدِيِّينَ وَافْسَحْ لَهُ فِي قَبْرِهِ وَنَوِّرْ لَهُ فِيهِ
O Allah, forgive him, raise his rank among the guided, make his grave spacious, and illuminate it for him.
Sahihاللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنْ عَذَابِ الْقَبْرِ وَمِنْ عَذَابِ جَهَنَّمَ وَمِنْ فِتْنَةِ الْمَحْيَا وَالْمَمَاتِ وَمِنْ شَرِّ فِتْنَةِ الْمَسِيحِ الدَّجَّالِ
O Allah, I seek refuge in You from the punishment of the grave, from the torment of the Fire, from the trials of life and death, and from the evil of the trial of the False Messiah.
Sahih