1 Kings 3:2 - Clarke's commentary and critical notes on the Bible

Only the people sacrificed in high places, because there was no house built unto the name of the LORD, until those days. The people sacrificed in high places - Could there be any sin in this, or was it unlawful till after the temple was built? for prophets, judges, the kings which preceded Solomon, and Solomon himself, sacrificed on high places, such as Gibeon, Gilgal, Shiloh, Hebron, Kirjath-jearim, etc. But after the temple was erected, it was sinful to offer sacrifices in any other place; yet here it is introduced as being morally wrong, and it is introduced, 1 Kings 3:3, as being an exceptionable trait in the character of Solomon. The explanation appears to be this: as the ark and tabernacle were still in being, it was not right to offer sacrifices but where they were; and wherever they were, whether on a high place or a plain, there sacrifices might be lawfully offered, previously to the building of the temple. And the tabernacle was now at Gibeon, 2 Chronicles 1:3. Possibly the high places may be like those among the Hindoos, large raised-up terraces, on which they place their gods when they bathe, anoint, and worship them. Juggernaut and Krishnu have large terraces or high places, on which they are annually exhibited. But there was no idol in the above case.