Jami` at-Tirmidhi Book 47, Hadith 387
The Day when mankind will stand before the Lord of all tat exists He said: “They will be standing in sweat up to the middle of their ear.” – Hammas said: To us it is Marfu - .
the Messenger of Allah said: “Verily, when the slave (of Allah) commits a sin, a black spot appears on his heart. When he refrains from it, seeks forgiveness and repents, his heart is polished clean. But if he returns, it increases until it covers his entire heart. And that is the ‘Ran’ which Allah mentioned: ‘Nay, but on their hearts is the Ran which they used to earn.’”
‘They Day when mankind will stand before the Lord of all that exists.’ He said: “One of them will be standing in sweat up to the middle of his ears.”