"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]