1 Kings 12:26-33

And Jeroboam said in his heart, Now will the kingdom return to the house of David: if this people go up to offer sacrifices in the house of Jehovah at Jerusalem, then will the heart of this people turn again unto their lord, even unto Rehoboam king of Judah; and they will kill me, and return to Rehoboam king of Judah. Whereupon the king took counsel, and made two calves of gold; and he said unto them, It is too much for you to go up to Jerusalem: behold thy gods, O Israel, which brought thee up out of the land of Egypt. And he set the one in Beth-el, and the other put he in Dan. And this thing became a sin; for the people went to worship before the one, even unto Dan. And he made houses of high places, and made priests from among all the people, that 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 went up unto 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 that he had made. And he went up unto the altar which he had made in Beth-el on the fifteenth day in the eighth month, even in the month which he had devised of his own heart: and he ordained a feast for the children of Israel, and went up unto the altar, to burn incense.