Abu Mas'ud Uqbah reported: The Messenger of Allah, peace and blessings be upon him, said, "Verily, among the words people obtained from the prophets are this:
If you feel no shame, then do as you wish."

Source: Sahih Bukhari 3296, Grade: Sahih (authentic) according to Al-Bukhari

lbn Rajab said, “The scholars interpret this saying in two ways. First, that it is a command of caution and warning, meaning if there is no shame then do as you wish, for Allah will repay you accordingly. Second, that it is a command of description, meaning that whoever does not have shame will do as he wishes, for it is shame that prevents evil deeds.”

Source: Jami' al-Ulfim wal-Hikam 20