Reference : Hisn al-Muslim 64

اللّهُـمَّ إِنِّـي أَسْأَلُـكَ بِأَنَّ لَكَ الْحَـمْدُ 
لا إِلـهَ إِلاّ أَنْـتَ وَحْـدَكَ لا شَـريكَ لَـكَ 
المَنّـانُ يا بَديـعَ السَّمواتِ وَالأَرْضِ 
يا ذا الجَلالِ وَالإِكْـرام يا حَـيُّ يا قَـيّومُ 
إِنِّـي أَسْأَلُـكَ الجَـنَّةَ وَأَعـوذُ بِـكَ مِنَ الـنّار
Allāhumma innī as'aluka bi'anna laka ‘l-ḥamd,
lā ilāha illā ant, waḥdaka lā sharīka lak, 
al-Mannān, yā Badī`as-samāwāti wa ‘l-arḍ
yā dha ‘l-Jalāli wa ‘l-'Ikrām, yā ḥayyu yā Qayyūm,
innī as'aluka ‘l-jannah, wa a`ūdhu bika minan-nār.

O Allah, I ask You, as You are the Owner of praise, 
there is none worthy of worship but You alone, You have no partner. 
You are the Giver of all good. O Creator of the heavens and the earth,
Owner of majesty and honor. O Living and Everlasting One, 
I ask you for Paradise, and I seek refuge in You from the fire.

Reference:
Abu Dawud, An-Nasa'i, Ibn Majah, At-Tirmidhi. See also Al-Albani, Sahih Ibn 
Majah 2/329.

Chapter: After the last tashahhud and before salam