Musnad Ahmad 27:939

Hassan narrated to us, Hammad ibn Salamah narrated to us, from Ayyub, from Nafi’, from Ibn Umar, that the Prophet, peace and blessings of Allah be upon him, recited this verse: "The day when mankind will stand before the Lord of the worlds" [Al-Mutaffifin: 6]. He said: "They will stand until the sweat reaches their ears."