ירמיהו, פרק ט״ז, פסוק ח׳

The prophet is instructed to withdraw from the normal social rhythms of his community, transforming his personal conduct into a living message. He is commanded to avoid participating in joyous gatherings, a behavior designed to serve as a symbolic sign and wonder for the people [מצודת דוד]. This restriction is directly tied to the prophecy of destruction, acting as a stark warning that God will soon silence all sounds of joy from the area [רש״י].

These gatherings center around venues where communal meals are held [מצודת ציון], primarily referring to wedding and marriage feasts [מצודת דוד, ביאור שטיינזלץ]. The command to avoid sitting with the celebrants [מצודת ציון, ביאור שטיינזלץ] is absolute and comprehensive. The prophet is forbidden from entering these places even if he has no intention of participating in the festivities. He cannot sit in their company merely to show respect, nor is he allowed to join them simply to satisfy his own personal need to eat and drink [מלבי״ם].