The ascension of a young boy to the throne marks a dramatic turning point for the Davidic dynasty. After being hidden deep within the Temple to escape the terror of Queen Athaliah, who sought to wipe out the royal line, the young heir is finally crowned. Throughout his reign, he is called by his full name, Jehoash, rather than the shortened Joash [ביאור שטיינזלץ].
The decision to crown him at exactly seven years old is rooted in a blend of practical necessity, legal development, and deep spiritual meaning. On a purely practical level, the timing was tied to the maintenance schedule of the Temple. Jehoash had been secretly sheltered in the Holy of Holies for six years. However, once every seven years, the sacred chamber underwent a thorough cleaning and clearing. Artisans and workers would be lowered into the room inside special boxes. Had the young boy remained there during this seventh year, he would inevitably have been discovered by the laborers. This would have exposed the secret to Queen Athaliah, endangering both the child's life and the future of the royal dynasty [נחל שורק, חומת אנך, אהבת יהונתן].
Beyond physical safety, the age of seven represents a crucial developmental milestone. At this stage, a child's mind begins to mature, allowing him to distinguish between right and wrong. This basic moral clarity is an absolute requirement for anyone expected to judge the people and carry the heavy responsibilities of kingship. This aligns with the legal recognition of a seven-year-old's capacity to engage in basic commercial transactions [רמב״ן מובא בנחל שורק, חומת אנך ואהבת יהונתן].
Spiritually, the first seven years of human life are considered a time of absolute purity. Even though the evil inclination is present from birth, it is entirely unable to dominate a person until the age of seven, a timeframe compared to the gestation period of a snake. Because of this, Jehoash was able to begin his rule from a state of total holiness and internal perfection [נחל שורק, אהבת יהונתן]. Furthermore, there is a profound conceptual link between his age and the essence of his new role. In the upper spiritual realms, kingship is identified as the seventh attribute, mirroring how the Sabbath is the seventh day of the week. Therefore, it was inherently fitting that his coronation took place precisely as he reached his seventh year [נחל שורק, חומת אנך].
Yet, because he assumed power at such a tender age, the young king's righteousness was not fully his own. His integrity and dedication to what was right were entirely dependent on the education and guidance he received from his mentor, Jehoiada the priest. As long as Jehoiada was there to teach and accompany him, Jehoash maintained a steady, righteous path in the eyes of God [אברבנאל].