Musnad Ahmad 27:414

Yazid narrated to us, Muhammad ibn Ishaq informed us, from Nafi’, from Ibn Umar, who said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "{The day when mankind will stand before the Lord of the Worlds} [Al-Mutaffifin: 6]," for the greatness of the Most Merciful, Blessed and Exalted is He, on the Day of Resurrection, until the sweat will bridle men up to the middle of their ears.