דברי הימים ב, פרק ל״ג, פסוק ט״ז

True repentance requires both personal action and public leadership. Manasseh completes his return to God by first focusing on the physical center of worship. He takes action to prepare, establish, and rebuild the altar [מנחת שי]. This effort is not about constructing a brand-new altar from scratch, but rather repairing and renewing the existing structure [מצודת דוד].

With the altar restored, Manasseh brings peace offerings and thanksgiving offerings. The specific choice of a thanksgiving offering serves as a direct expression of gratitude to God, thanking Him for returning him safely to Jerusalem and restoring his royal kingdom [רש״י].

Manasseh's return to God then expands from a personal experience into a public mission. He turns to the people of Judah and actively encourages them to serve God. This public declaration proves the absolute sincerity of his change of heart. He is not only abandoning his former ways but is taking responsibility to correct the misguided instructions and leadership he had previously forced upon the nation [ביאור שטיינזלץ].