Yazid bin Abi Ziyad يزيد بن أبي زياد · The Book of Drinks

"The Messenger of Allah said: 'The adulterer is not a believer at the moment when he is committing adultery, and the wine drinker is not a believer at the moment when he is drinking wine, and the thief is not a believer at the moment when he is stealing, and the robber is not a believer at the moment when he is robbing and people are looking on.'"