Who is the Dayyūth (pimp/cuckold) who will not enter Paradise? And does this description apply to one who allows his female محارم (unmarriageable kin) to work in mixed-gender environments or allows male relatives to enter upon them, while inwardly disapproving of it?

The Dayouth is he who condones depravity among his kin, meaning he lacks protective jealousy over his mahārim (unmarriageable kin). It has been mentioned in the hadith that the Dayouth will not enter Paradise. This jealousy necessitates denunciation, and denunciation depends on ability. If one is able to denounce with the hand or tongue, then denunciation by the heart alone is not sufficient. Among the means of reform is abandonment (hajr), the ruling of which varies according to circumstances and benefit.