'Abdullah bin 'Amr bin al-'Aas (radhiyaAllaahu 'anhu) reported that Allah's Messenger (sallahAllaahu 'alayhi wasallam) said; "On the Day of Ressurection Allah will single out a man from my Ummah in front of all the people. Ninety-nine scrolls will be unrolled for him; every scroll will be as long (far) as the eye can see.
Then Allah will say: Do you deny anything from this? Did the Angels that record your deeds wrong you?
So the man will say: No, my Lord.
Allah will say: Do you have an excuse?
The man will say: No, my Lord.
Allah will say: "There is indeed, for you a good deed with Us, there will be no oppression upon you today."
Then a card will be brought forward and in it will be: 'Ashhadu anla ilaaha illah Allah, wa ashhadu anna Muhammadan 'abduhu wa rasuluh,' (I testify that there is none worthy of worship except Allah, and Muhammad is His slave and His Messenger.)
Then Allah will say: Bring your bad deeds.
The man will say: What is this card compared to these scrolls?
He (Allah) will say: Indeed you will not be wronged.
The Prophet continued: The scrolls will be put on one side of the scales, and the card will be put on the other side, and the scrolls will be light and the card would be heavy. Nothing outweighs the name of Allah (subhaana wa ta'laa)."
[Ahmad, at-Tirmidhi and others] Saheeh