Abu Huraira reported Allah's Messenger (ﷺ) as saying:
A bulky person would be brought on the Day of judgment and he would not carry the weight to the eye of Allah equal even to that of a gnat. Nor shall We set up a balance for them on the Day of Resurrection" (xviii. 105). (IT)
Reference (IT): Sahih Muslim 2785 (IT)
In-book reference (IT): Book 52, Hadith 1 (IT)
USC-MSA web (English) reference(deprecated numbering scheme): Book 39, Hadith 6698 (IT)