Following the absolute failure of the prophets of Baal, the moment of ultimate decision arrives. Elijah steps forward to take the lead, guiding the people through a process of physical and emotional return, as well as material and spiritual rebuilding. He begins by asking the crowd to come close to him. On a practical level, this ensures that everyone can watch his actions clearly, proving there is no trickery or hidden mechanism used to spark the fire [מצודת דוד, אברבנאל]. On a deeper, spiritual level, this is a call for unity and clarity. Elijah asks the people to stop wavering between different beliefs, to unite around their faith in God, and to approach with a whole heart, completely free of doubt [אלשיך, חומת אנך].
The physical act of rebuilding the broken structure is described as a form of healing, a concept borrowed from medicine to illustrate the restoration of something that has been completely shattered [רד״ק, מצודת דוד, מצודת ציון, ביאור שטיינזלץ]. The primary approach among commentators is that this was an ancient altar dedicated to God, standing on Mount Carmel from a time when private altars were permitted. Over the years, kings of Israel and worshipers of Baal had destroyed it. According to tradition, this original structure was built by King Saul [רש״י, רד״ק, מצודת דוד, אברבנאל]. Alternatively, some explain that this was not an ancient site at all. Instead, it was an altar Elijah himself had built earlier that very day, which the prophets of Baal then trampled and ruined in their wild, contemptuous frenzy [מלבי״ם, ביאור שטיינזלץ].
Beyond the physical stones, the healing of the altar carries a profound symbolic meaning. The concept of an altar to God had been entirely forgotten from the hearts and minds of the ten tribes. The true restoration occurred when Elijah guided the people toward repentance, bringing the awareness of God back into their lives [רש״י, רד״ק, אברבנאל]. Furthermore, a person can be viewed as an altar themselves, where the body is the structure and the soul is the offering presented to God through thoughts of return. Sin and idol worship break down this personal altar, and the spiritual awakening sparked by Elijah is what ultimately healed it [אלשיך]. Finally, the simple act of the people coming together in peace to approach Elijah repaired the fractured nation, restoring the Divine Presence that had previously left them [חומת אנך].