1 Kings 12:28-33

So the king took counsel [and followed bad advice] and made two calves of gold. And he said to the people, “It is too much for you to go [all the way] up to Jerusalem; behold your gods, O Israel, who brought you up out of the land of Egypt.” He set the one [golden calf] in Bethel, and the other he put in Dan. Now this thing became a sin [for Israel]; because the people went to worship before the one [or the other of them] as far as Dan. And Jeroboam also made houses on high places, and he made priests from all people who were not of the sons (descendants) of Levi. Jeroboam held a feast on the fifteenth day of the eighth month, like the feast which is kept in Judah, and he went up to the altar; he did this in Bethel, sacrificing to the calves which he had made. And he stationed in Bethel the priests of the high places which he had made. [Lev 23:34] So he went up to the altar which he had made in Bethel on the fifteenth day of the eighth month, in the month which he had devised in his own heart [in defiance of God’s commandments]; and he held a feast for the Israelites and he went up to the altar to burn incense [in defiance of God’s law.]