Matthew Henry Commentary 1 Kings 11:9-13

"And Jehovah was angry with Solomon, because his heart was turned away from Jehovah, the God of Israel, who had appeared unto him twice, and had commanded him concerning this thing, that he should not go after other gods: but he kept not that which Jehovah commanded. Wherefore Jehovah said unto Solomon, Forasmuch as this is done of thee, and thou hast not kept my covenant and my statutes, which I have commanded thee, I will surely rend the kingdom from thee, and will give it to thy servant. Notwithstanding in thy days I will not do it, for David thy father`s sake: but I will rend it out of the hand of thy son. Howbeit I will not rend away all the kingdom; but I will give one tribe to thy son, for David my servant`s sake, and for Jerusalem`s sake which I have chosen." — 1 Kings 11:9-13 (ASV)

The Lord told Solomon, it is likely by a prophet, what he must expect for his apostasy. Though we have reason to hope that he repented and found mercy, yet the Holy Ghost did not expressly record it, but left it doubtful, as a warning to others not to sin. The guilt may be taken away, but not the reproach; that will remain. Thus, it must remain uncertain to us until the day of judgment, whether or not Solomon was left to suffer the everlasting displeasure of an offended God.