Albert Barnes Commentary 1 Kings 10:9

"Blessed be Jehovah thy God, who delighted in thee, to set thee on the throne of Israel: because Jehovah loved Israel for ever, therefore made he thee king, to do justice and righteousness." — 1 Kings 10:9 (ASV)

Blessed be the Lord your God — This acknowledgment of Yahweh falls below the confessions of Hiram (2 Chronicles 2:12) and Cyrus (Ezra 1:3). It does not imply more than an admission of His power as a local deity, namely, that He is the God of the Jews and of their country.