1 Kings 12:31-33
New International Version
31 Jeroboam built shrines(A) on high places and appointed priests(B) from all sorts of people, even though they were not Levites. 32 He instituted a festival on the fifteenth day of the eighth(C) month, like the festival held in Judah, and offered sacrifices on the altar. This he did in Bethel,(D) sacrificing to the calves he had made. And at Bethel he also installed priests at the high places he had made. 33 On the fifteenth day of the eighth month, a month of his own choosing, he offered sacrifices on the altar he had built at Bethel.(E) So he instituted the festival for the Israelites and went up to the altar to make offerings.