The Rights of Allah against oneself
Risālat al-Ḥuqūq|Volume 1|Book 1|Chapter 2
وَأَمَّا حَقُّ السَّمْعِ فَتَنْزِيهُهُ عَنْ سَماع الغيبةِ و سَماعِها لا يحِلّ سَماعه.
The right of hearing is to keep it pure from listening to backbiting (ghiba) and listening to that to which it is unlawful to listen.