Originally Posted by AV1611

Matthew Henry notes that "The feast of tabernacles, which God had appointed on the fifteenth day of the seventh month, he adjourned to the fifteenth day of the eighth month (1 Kings 12:32), the month which he devised of his own heart, to show his power in ecclesiastical matters, 1 Kings 12:33. The passover and pentecost he observed in their proper season, or did not observe them at all, or with little solemnity in comparison with this."

Jamieson, Fausset and Brown write "he changed the feast of tabernacles from the fifteenth of the seventh to the fifteenth of the eighth month".

Keil and Delitzsch note that "Jeroboam also transferred to the eighth month the feast which ought to have been kept in the seventh month (the feast of tabernacles, Leviticus 23:34.)."