Summary: Does it matter if King Solomon was saved? Can we know for sure if we will see him in the new heavens and earth? There are some clues in the scripture. There may also be a teaching reason that his death is mentioned without repentance.
Holiness, Holy – Vine’s Expository Dictionary
The Disciple’s Road – Was Solomon Saved?
Test All Things – Was Solomon Saved?
Links to Reading Song of Solomon
Links to Reading 1 and 2 Kings