“Whoever asks Allah for Paradise three times:
[Allahumma inni as'aluk al-Jannah],
then Paradise will say: “O Allah! Enter him into
Paradise!”
And whoever seeks protection with Allah
from the Fire three times [Allahumma najjini
min an-Nar],
the Fire will say: “O Allah! Protect him from
the Fire!“”
[Reported by at-Tirmidhi, and it is authentic]