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 ثَبِّتْنِي عِنْدَ السُّؤَالِ، اللَّهُمَّ ثَبِّتْنِي بِالْقَوْلِ الثَّابِتِ فِي الْحَيَاةِ الدُّنْيَا وَفِي الْآخِرَةِ
O Allah, keep me firm at the time of questioning. O Allah, make me firm with the firm word in the life of this world and in the Hereafter.
Sahihإِنَّ لِلَّهِ مَا أَخَذَ وَلَهُ مَا أَعْطَى وَكُلُّ شَيْءٍ عِنْدَهُ بِأَجَلٍ مُسَمًّى
To Allah belongs what He took, and to Him belongs what He gave, and everything with Him has an appointed time.
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 لَا تَحْرِمْنَا أَجْرَهُ وَلَا تُضِلَّنَا بَعْدَهُ
O Allah, do not deprive us of his reward, and do not lead us astray after him.
Sahih