Surah 41. Fussilat, Ayah 20

 It is reported in Ibn Kathîr’s commentary that, on the Day of Judgment, the wicked will deny the evil deeds in their records—as a desperate attempt to escape the horrible punishment in Hell. They will be asked if they accept Allah, the angels, or even their own families and neighbours as witnesses, but they will refuse. So Allah will make their organs testify against them.

All the members of their bodies and the faculties of their minds, which they misused, will bear witness against them. Similarly, in xxxvi. 65, their hands and their feet bear witness against them. The "skin" not only includes the sense of touch (which is so often misused in sex), but also the sense of taste and the sense of smell, which are specialised forms of the organ of touch. All the sensory organs, and all their intellectual and emotional counterparts advance us by their use and pull us down by their misuse. They become tell-tale witnesses against us if abused.