Charles Spurgeon Commentary 1 Kings 12:33

"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." — 1 Kings 12:33 (ASV)

And ordained a feast unto the children of Israel: and he offered upon the altar, and burnt incense.

Thus Israel was led astray at the very beginning. She came to the turning of the roads, and took the wrong course, and she went from bad to worse. God save all of us from following her evil example, but may we all serve the one living and true God, for our Lord Jesus Christ's sake! Amen.