1 Kings 3:2-4

3:2 Now the people were offering sacrifices at the high places, because in those days a temple had not yet been built to honor the Lord. 3:3 Solomon demonstrated his loyalty to the Lord by following the practices of his father David, except that he offered sacrifices and burned incense on the high places.

3:4 The king went to Gibeon to offer sacrifices, for it had the most prominent of the high places. Solomon would offer up a thousand burnt sacrifices on the altar there.