And Jeroboam ordained a feast on the fifteenth day of the eighth month, like the feast that was in Judah, and he offered sacrifices on the altar; he made this offering in Bethel to sacrifice to the calves he had set up, and he installed priests in Bethel for the high places he had set up.

Leviticus 23:33
And the LORD said to Moses,

Leviticus 23:34
"Speak to the Israelites and say, 'On the fifteenth day of the seventh month the Feast of Tabernacles to the LORD begins, and it continues for seven days.

Numbers 29:12
On the fifteenth day of the seventh month, you are to hold a sacred assembly; you must not do any regular work, and you shall observe a feast to the LORD for seven days.

1 Kings 8:2
And all the men of Israel came together to King Solomon at the feast in the seventh month, the month of Ethanim.

1 Kings 8:5
There, before the ark, King Solomon and the whole congregation of Israel who had assembled with him sacrificed so many sheep and oxen that they could not be counted or numbered.

1 Kings 13:33
Even after these events, Jeroboam did not repent of his evil ways, but again he appointed priests for the high places from every class of people. He ordained anyone who desired to be a priest of the high places.

Amos 7:10
Then Amaziah the priest of Bethel sent word to Jeroboam king of Israel, saying, "Amos has conspired against you in the midst of the house of Israel. The land cannot bear all his words,

Amos 7:13
But never prophesy at Bethel again, because it is the sanctuary of the king and the temple of the kingdom."

And Jeroboam ordained a feast in the eighth month, on the fifteenth day of the month, like to the feast that is in Judah, and he offered on the altar. So did he in Bethel, sacrificing to the calves that he had made: and he placed in Bethel the priests of the high places which he had made.