1 Kings 12:29, 32

He placed these calf idols in Bethel and in Dan—at either end of his kingdom.

And Jeroboam instituted a religious festival in Bethel, held on the fifteenth day of the eighth month, in imitation of the annual Festival of Shelters in Judah. There at Bethel he himself offered sacrifices to the calves he had made, and he appointed priests for the pagan shrines he had made.