Musnad Ahmad 27:869

Husayn ibn Muhammad narrated to us, Hammad ibn Zayd narrated to us, from Ayyub, from Nafi’, from Abdullah ibn Umar, who attributed the hadith to the Prophet (ﷺ) regarding the saying of the Exalted: "The Day when mankind will stand before the Lord of the worlds" [Al-Mutaffifin: 6]. He said: "They will stand on the Day of Resurrection in sweat up to the middle of their ears."