It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "On the Day of Resurrection a man from my Ummah will be called out before all of creation, and ninety-nine scrolls will be spread out before him, each scroll extending as far as the eye can see. Then (Allah Almighty) will say: Do you deny anything of this? He will say: No, O my Lord. Allah Almighty will say: I do not see that you have any good deeds with Us, and today no injustice will be done to you. Then a card will be brought out for him on which is written: 'There is none worthy of worship except Allah, and Muhammad (peace and blessings be upon him) is His servant and Messenger.' So his weight will become heavy. He will say: O my Lord, what is this card compared with these scrolls? Then the scrolls will be placed in one pan of the scale and the card in the other pan, and the scrolls will become light and the card will be heavy."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13627