1 Kings 12:33
“So he offered upon the altar which he had made in Beth–el the fifteenth day of the eighth month, even in the month which he had devised of his own heart; and ordained a feast unto the children of Israel: and he offered upon the altar, and burnt incense.”
And he made an house of high places, and made priests of the lowest of the people, which were not of the sons of Levi.
And Jeroboam ordained a feast in the eighth month, on the fifteenth day of the month, like unto the feast that is in Judah, and he offered upon the altar. So did he in Beth–el, sacrificing unto the calves that he had made: and he placed in Beth–el the priests of the high places which he had made.
So he offered upon the altar which he had made in Beth–el the fifteenth day of the eighth month, even in the month which he had devised of his own heart; and ordained a feast unto the children of Israel: and he offered upon the altar, and burnt incense.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Related Verses
“And Jeroboam ordained a feast in the eighth month, on the fifteenth day of the month, like unto the feast that is in Judah, and he offered upon the altar. So did he in Beth–el, sacrificing unto the calves that he had made: and he placed in Beth–el the priests of the high places which he had made.”
“Moreover the altar that was at Beth–el, and the high place which Jeroboam the son of Nebat, who made Israel to sin, had made, both that altar and the high place he brake down, and burned the high place, and stamped it small to powder, and burned the grove.”
“And he reared up an altar for Baal in the house of Baal, which he had built in Samaria.”
“And when the king was come from Damascus, the king saw the altar: and the king approached to the altar, and offered thereon.”
“But the high places were not taken away: the people still sacrificed and burnt incense in the high places.”