1 Kings 12:28-33

King Jeroboam asked for advice. Then he made two golden calves. “It is too long a journey for you to go to Jerusalem to worship,” he said to the people. “Israel, here are your gods who brought you out of Egypt.” Jeroboam put one golden calf in the city of Bethel and the other in the city of Dan. This became a very great sin, because the people traveled as far as Dan to worship the calf there. Jeroboam built temples on the places of worship. He also chose priests from all the people, not just from the tribe of Levi. And he started a new festival on the fifteenth day of the eighth month, just like the festival in Judah. During that time the king offered sacrifices on the altar, along with sacrifices to the calves in Bethel he had made. He also chose priests in Bethel to serve at the places of worship he had made. So Jeroboam chose his own time for a festival for the Israelites—the fifteenth day of the eighth month. During that time he offered sacrifices on the altar he had built in Bethel. He set up a festival for the Israelites and offered sacrifices on the altar.