A profound moral collapse plagues Jerusalem, characterized by the presence of the three most severe transgressions: murder, idol worship, and sexual immorality [מלבי״ם].
The tragedy of bloodshed begins with those who peddle in gossip and slander [מצודת ציון]. These individuals travel from the vulnerable to the powerful, spreading malicious lies [רד״ק]. Driven by deep-seated jealousy, this slander acts as a primary catalyst for the violence that fills the city [מלבי״ם]. Their intent is not merely to ruin reputations but deliberately to bring about the execution of their targets, thereby shedding innocent blood [מצודת דוד, ביאור שטיינזלץ].
The spiritual betrayal then moves to the mountain peaks, the traditional sites for pagan rituals [ביאור שטיינזלץ]. The people partake in feasts made from sacrifices and offerings dedicated to false gods [מצודת דוד, רד״ק]. The very act of eating these meals on the mountains is recognized as a direct expression of idol worship itself [רש״י].
Finally, the city is consumed by widespread depravity. The primary approach among commentators views this corruption as a broad reference to sexual immorality and forbidden relationships, setting the stage for specific sins that will follow [רד״ק, ביאור שטיינזלץ, מלבי״ם]. Alternatively, this depravity is understood more generally as a state of deep disgrace and wickedness [מצודת ציון], or as the active plotting of malicious schemes and wicked counsel [רש״י].