Musar zu Bereschit 8:9

A person should be especially careful not to utter words of mockery or tale-bearing in the synagogue, for the dwelling place of the Shechinah is in the synagogues and study halls. When people are not careful to refrain from jocularity, lightheadedness, tale-bearing and derogatory speech in the synagogue it causes the Shechinah to depart from Israel. In this connection the Zohar (Tikkun 6, 22b) ascribes to the Shechinah the verse, “And the dove found no resting place” (Bereishis 8:9). As a result of this sin numerous synagogues have been destroyed, to our chagrin, because people allowed the Side of Evil to mix into the camp of the Shechinah, which was to have been entirely holy. It is not good to bring foreign matters into places of holiness. Therefore a person should be careful whenever he engages in holy matters not to cause malignant spirits to mix in, Heaven forbid.