Musannaf Ibn Abi Shayba 33:769

Ibn ‘Uyaynah narrated to us, from ‘Amr, from ‘Ubayd ibn ‘Umayr, who said: The great, tall man will be brought on the Day of Resurrection and placed on the scale, but he will not weigh as much as the wing of a mosquito in the sight of Allah. And he recited: "And We will not assign to them on the Day of Resurrection any weight."