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 will be brought, then the scale will be brought, then ninety-nine scrolls will be brought, each scroll extending as far as the eye can see, containing his sins and errors, and they will be placed in one pan of the scale. Then a sheet like this will be brought" — and he (peace and blessings be upon him) gestured with his hand and held his thumb — "on which is written: 'There is none worthy of worship except Allah, and Muhammad (peace and blessings be upon him) is the Messenger of Allah.' It will be placed in the other pan, and it will outweigh his sins and errors."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13658