If this people go up to offer sacrifices in the temple of the LORD at Jerusalem, then the heart of this people will turn again to their lord, to Rehoboam king of Judah, and they will kill me and return to Rehoboam king of Judah.”
We have here the beginning of the reign of Jeroboam. He built Shechem first and then Penuel - beautified and fortified them, and probably had a palace in each of them for himself (Kg1 12:25), the former in Ephraim, the latter in Gad, on the other side Jordan.
Commenting on 1 Kings 12:25-33
And he set the one in Bethel,.... In the southern part of the land, on the border of Ephraim and Benjamin; and the rather he chose this place, because its name signifies the house of God, and had been a sacred place, where Jacob more than once enjoyed the divine Presence: and the other put he in Dan: in the northern part of the land...
If this people go up to do sacrifice in the house of the LORD at Jerusalem, then shall the heart of this people turn again unto their lord, [even] unto Rehoboam king of Judah, and they shall kill me, and go again to Rehoboam king of Judah. (l) He feared least his people should have by this means been enticed to rebel against him.