The Kelipos nurture from the speech of a Jew:<a href="#_ftn1" name="_ftnref1">[1]</a>
It is forbidden to speak in a bathroom as the speech of a Jew is holy and allow the Kelipos that are found in the bathroom to nurture from it.
<a href="#_ftnref1" name="_ftn1">[1]</a> Soles Belula 3:2 brought in Kaf Hachaim 3:6

Shulchan Aruch HaRav | The Kelipos nurture from the speech of a Jew:?

The Kelipos nurture from the speech of a Jew:[1] It is forbidden to speak in a bathroom as the speech of a Jew is holy and allow the Kelipos that are found in the bathroom to nurture from it. [1] Soles Belula 3:2 brought in Kaf Hachaim 3:6