اللّهُـمَّ إِنِّـي أَسْأَلُـكَ الجَـنَّةَ وأََعوذُ بِـكَ مِـنَ الـنّار
Allāhumma innī as'aluka ‘l-jannah wa a`ūdhu bika minan-nār.
O Allah, I ask You for Paradise, and I seek Your protection from the Fire.
Abu Dawud. See also Al-Albani, Sahih Ibn Majah 2/328.