The Curse of Sin
It is reported that Hammād b. Salamah – Allāh have mercy on him – said, “Being cursed (al-la’nah) is not some blackness that can be seen in the face, but it is when you do not leave a sin without falling into another.”
Abū Bakr Al-Daynūrī, Al-Mujālasah wa Jawāhir Al-‘Ilm article 765.