מלכים א, פרק י״ד, פסוק כ״א

After the narrative concludes the account of Jeroboam's rule, the focus shifts to the beginning of Rehoboam's reign in Judah. Rehoboam assumed the throne at the age of forty-one. This mathematical detail reveals that he was born before his father, Solomon, even became king, since Solomon ruled for a total of forty years. Consequently, Rehoboam was, in fact, the firstborn son [ביאור שטיינזלץ]. Highlighting his advanced age also serves to underscore a bitter irony in his behavior. When Rehoboam chose to follow the reckless advice of young men—a decision that ultimately fractured the kingdom—it was not due to a lack of chronological maturity. Unlike his father Solomon, who ascended the throne as a youth but possessed the wisdom of an elder, Rehoboam was an adult in years but merely a child in his wisdom and character [אברבנאל].

Rehoboam ruled for seventeen years from Jerusalem, specifically noted as the city God had chosen. Highlighting the city's special status is not a mere geographical detail; rather, it amplifies the profound disappointment in the king. Jerusalem's inherent holiness, having been selected from all the tribes of Israel as the resting place for God's presence, should have inspired the king to do what is right and prevented him from straying from God's path. Yet, despite governing from such a sacred location, he ultimately chose a path of wickedness [רש"י, אברבנאל, מלבי"ם].

The root of the king's spiritual downfall is traced directly to his mother, Naamah the Ammonite. Commentators agree that noting her name and foreign origin exposes the underlying cause of his sins. Although Rehoboam walked a straight path and feared God during the first three years of his reign, he was eventually pulled back to the environment in which he was raised and began to engage in idol worship [מצודת דוד, רד"ק, אברבנאל]. Naamah had practiced idolatry during Solomon's later years, and she actively influenced her son, advising him to act wickedly. Ultimately, the pagan customs she instilled in him overpowered the sacred influence of Jerusalem [רלב"ג, מלבי"ם, אברבנאל].