اللَّهُمَّ إِنِّي أَسْأَلُكَ الْجَنَّةَ وَأَعُوذُ بِكَ مِنَ النَّارِ
Allaahumma innee as alukal-jannata wa a oothu bika minan-naar.
O Allah, I ask You for Paradise and seek Your protection from the Fire.
Abu Dawud. See also Al-Albani, Sahih Ibn Majah 2/328.