verily, they shall be questioned on the Day of Resurrection about that which they used to fabricate

means, the lies they used to tell and the falsehood they used to fabricate. Ibn Abi Hatim recorded that Abu Umamah, may Allah be pleased with him, said that the Messenger of Allah conveyed the Message with which he was sent, then he said:

«Beware of injustice, for Allah will swear an oath of the Day of Resurrection and will say: "By My glory and majesty, no injustice will be overlooked today." Then a voice will call out, "Where is so-and-so the son of so-and-so?" He will be brought forth, followed by his good deeds which appear like mountains while the people are gazing at them in wonder, until he is standing before the Most Merciful. Then the caller will be commanded to say: "Whoever is owed anything by so-and-so the son of so-and-so, or has been wronged by him, let him come forth." So they will come forth and gather before the Most Merciful, then the Most Merciful will say: "Settle the matter for My servant." They will say, "How can we settle the matter?" He will say, "Take from his good deeds and give it to them." They will keep taking from his good deeds until there is nothing left, and there will still people with scores to be settled. Allah will say, "Settle the matter for My servant." They will say, "He does not have even one good deed left." Allah will say, "Take from their evil deeds and give them to him."»

Then the Prophet quoted this Ayah:

There is a corroborating report in the Sahih with a different chain of narration:

«A man will come on the Day of Resurrection with good deeds like mountains, but he had wronged this one, taken the wealth of that one and slandered the honor of another. So each of them will take from his good deeds. And if there is nothing left of his good deeds, it will be taken from their evil and placed on him.»