What famous hadeeth, you ask?
Narrated Ubaadah: The Prophet (salallahu alaihi wasallam) said, “If anyone testifies that none has the right to be worshipped but Allah Alone Who has no partners, and that Muhammad is His Slave and His Messenger, and that Isa is Allah’s Slave and His Messenger and His Word which He bestowed on Maryam and a Spirit created by Him, and that Paradise is true, and Hell is true, Allah will admit him into Paradise with the deeds which he had done even if those deeds were few.”
(Junada, the sub-narrator said, “Ubaadah added, ‘Such a person can enter Paradise through any of its eight gates he likes.”)
[Sahih Al-Bukhari, Volume No. 4, Hadeeth No. 644]
Here’s a detailed explanation of this simple yet fantastic hadeeth.