1 Kings 12:33
So he offered upon the altar which he had made in Beth–el the fifteenth day of the eighth month, even in the month which he had devised of his own heart; and ordained a feast unto the children of Israel: and he offered upon the altar, and burnt incense.
Cross-reference
Verse 32 first introduces the feast and altar — verse 33 then reiterates with added detail, showing Jeroboam's deliberate innovation of a new religious calendar.
1 Kings 13:1 narrates the prophet confronting Jeroboam at the very altar he built, continuing the same event.
Numbers 15:39 forbids following your own heart; Jeroboam's self-devised feast directly violates that command.
1 Samuel 13:12 shows Saul offering sacrifice unlawfully; both kings overstep priestly roles and invent worship.
Psalm 106:39 describes Israel defiling themselves with idolatry; Jeroboam's actions exemplify that pattern.
Isaiah 29:13 condemns worship taught by human precept; Jeroboam's feast is a human invention, not God's command.
Matthew 15:6 shows human tradition voiding God's word; Jeroboam's altar and feast nullify God's prescribed worship.
Mark 7:13 similarly indicts human tradition for canceling God's commands; Jeroboam's actions exemplify this.
Exodus 32:5 records Aaron proclaiming a feast to the golden calf; Jeroboam directly imitates that pattern.
2 Chronicles 26:16 describes Uzziah's pride in burning incense, paralleling Jeroboam's unauthorized priestly role at the altar.
2 Chronicles 17:4 shows Jehoshaphat seeking God's ways, contrasting Jeroboam's self-devised worship at Bethel.
Hosea 11:2 notes Israel burning incense to idols, echoing the idolatry Jeroboam initiated at Bethel.