דברי הימים ב, פרק כ״א, פסוק י״א

A severe spiritual decline takes hold under the king's leadership, marked by the establishment of foreign worship centers and the corruption of the people's faith. The king constructs altars specifically intended for idol worship across the mountains of Judah [מצודת דוד].

His actions do not end with merely building these sites. He actively incites the residents of Jerusalem to participate in foreign worship. This profound betrayal is likened to prostitution. When applied to an entire nation, this concept specifically refers to the embrace of idolatry [מלבי״ם]. Anyone who abandons the reverence of God to serve foreign deities is compared to a wife who breaks her marriage vows and is unfaithful to her husband [רש״י]. Beyond encouraging this spiritual adultery, the king takes deliberate, active measures to push the people away from the worship of God entirely [מצודת דוד, ביאור שטיינזלץ].