Musnad Ahmad

It is narrated from Sayyiduna Ibn Amr (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "On the Day of Resurrection, Allah will bring forth one of my followers before all of creation and will open for him ninety-nine registers, each register stretching as far as the eye can see. Allah will say to him, 'Do you deny any of this? Did My recording angels wrong you in any way?' He will reply, 'No, O Lord.' Allah will say, 'Do you have any excuse or any good deed?' The man, bewildered, will say, 'No, O Lord.' Allah will say, 'On the contrary, you have one good deed with Us. Today you will not be wronged.' Then a slip of paper will be brought out, on which will be written: 'I bear witness that there is no deity except Allah, and that Muhammad (peace and blessings be upon him) is His servant and Messenger.' Allah will say, 'Bring it to the scale.' The man will say, 'O Lord, what is this slip of paper compared to these great registers?' He will be told, 'Today you will not be wronged.' So the registers will be placed on one side of the scale, and the slip of paper on the other side; the side with the registers will be lifted, and the side with the slip of paper will weigh down, for nothing is heavier than the name of Allah, Who is the Most Merciful, the Most Compassionate."