The Messenger of Allah ﷺ said, "On the Day of Resurrection, a great, heavy man will come forward, yet he will not weigh with Allah as much as a mosquito's wing." Then he said, "Recite, 'So We will not assign to them on the Day of Resurrection any weight' [Kahf 18:105]."
عن رسول الله ﷺ قال: إنه ليأتي الرجل العظيم السمين يوم القيامة، لا يزن عند الله جناح بعوضة وقال: اقرؤوا{فلا نقيم لهم يوم القيمة وزنا} [الكهف: ١٠٥].
Bukhari narrated it in the tafsir (4729), and Muslim in the description of the Resurrection, Paradise, and Hell (2785), both through the route of Yahya bin Bukayr, who said, Mughira bin Abdul-Rahman Hizami told me, who said, Abu Zinad told me, from Araj, from Abu Hurairah, who then related it.