C. F. Keil and Franz Delitzsch on 2 Chronicles 9:1-12

2Ch 9:1-12 The visit of the queen of Sheba. Cf. 1Ki 10:1-13. - This event is narrated as a practical proof of Solomon’s extraordinary wisdom. The narrative agrees so exactly in both texts, with the exception of some few quite unimportant differences, that we must regard them as literal extracts from an original document which they have used in common. For the commentary on this section, see on 1Ki 10:1-13.