Anas ibn Malik (may Allah be pleased with him) narrated the Messenger of Allah said: “Whoever asks Allah for Jannah three times, Paradise says, “ Oh Allah enter him into Jannah. Whoever seeks protection with Allah from Hell three times, Jahanim says, “ Oh Allah protect him from the Fire.”
Collected by At-Tirmithi (2572) and others. Shaykh Al-Albani (May Allah have mercy on him) graded this hadeeth as being Saheeh in Saheeh At-Tirmithi.
اللهم اِنّي أَسْئَلُكَ الجَنّةُ الفِردَوْس، وأعُوْذْوبِكَ مِنَ النَّار
Allaahumma inni alukal Jannatul Firdous wa a’udhu bika minnan-naar.
(O Allah I ask you for gardens of firdous and I seek refuge from the fire)