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: "Indeed, Allah will save a man from my Ummah who has ninety-nine registers, each register stretching as far as the eye can see. Then Allah Almighty will say: 'Do you deny any of this? Have My guardian scribes wronged you?' He will say: 'No, O my Lord!' Allah Almighty will say: 'Rather, you have one good deed with Me, and no injustice will be done to you today.' Then a card (bitaqah) will be brought out on which is written: 'I bear witness that there is no god worthy of worship but Allah, and that Muhammad (peace and blessings be upon him) is His servant and His Messenger.' Allah Almighty will say: 'Come forward for your weighing (the weighing of deeds).' He will say: 'What is this card worth against these (huge) registers?' So the card will prove heavier, and nothing can be heavier alongside the name of Allah."
This hadith is narrated from the Messenger of Allah (peace and blessings be upon him) only with this chain; Amir bin Yahya (may Allah have mercy on him) is alone in narrating it.
Hadith Referenceالمعجم الأوسط / باب العين / 4725
Hadith Takhrij«أخرجه ابن حبان فى «صحيحه» برقم: 225، والحاكم فى «المستدرك» برقم: 9، 1943، والترمذي فى «جامعه» برقم: 2639، 2639 (م)، وابن ماجه فى «سننه» برقم: 4300، وأحمد فى «مسنده» برقم: 7114، 7187، وعبد بن حميد فى «مسنده» برقم: 339، والطبراني فى «الكبير» برقم: 14614، 14645»