Hisnul Muslim 61

After the final tashahhud and before salam

اللَّهُمَّ إِنِّي أَسْأَلُكَ الْجَنَّةَ وأََعُوذُ 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.