1 Chronicles 21:18 (KJV) states, "Then the angel of the Lord commanded Gad to say to David, that David should go up, and set up an altar unto the Lord in the threshing floor of Ornan the Jebusite."

This verse comes from a passage in 1 Chronicles that describes the consequences of David's sinful decision to take a census of the people of Israel. This action was contrary to God's will, as it demonstrated a lack of trust in God's ability to provide and protect His people. As a result, the Lord sent a plague upon Israel, causing the death of 70,000 men. In response to this devastation, David sought the Lord's mercy and guidance on how to atone for his sin and stop the plague. The verse in question represents the point at which the angel of the Lord commands the prophet Gad to instruct David to go up and set up an altar unto the Lord in the threshing floor of Ornan the Jebusite as a means of seeking forgiveness and stopping the plague.

An important theme in this verse is the concept of atonement and reconciliation. David's actions had brought about a great tragedy for the people of Israel, and he sought God's guidance on how to make amends. The placement of the altar at the threshing floor of Ornan the Jebusite symbolizes the act of sacrificing and offering in order to seek forgiveness and restoration of God's favor. This act of setting up an altar was a means of acknowledging God's sovereignty and seeking reconciliation with Him.

The choice of the threshing floor as the location for the altar is significant. In biblical times, the threshing floor was a place where the grain was separated from the chaff, and it often symbolized a place of judgment and purification. Setting up the altar in this location symbolizes the process of purification and atonement, where the impurities and sins of the people are separated and removed through the act of sacrifice and offering.

Furthermore, the mention of Ornan the Jebusite as the owner of the threshing floor carries symbolic significance as well. The Jebusites were a pagan people who inhabited the land of Canaan before the Israelites conquered it. By setting up the altar on Ornan's property, David was making a powerful statement about the all-encompassing nature of God's forgiveness and reconciliation. It demonstrates that God's grace is not limited by ethnic boundaries or national identity, but is extended to all who seek Him in repentance and faith.

The verse also highlights the role of intermediaries in communicating God's will. The angel of the Lord commands Gad to deliver a message to David, emphasizing the importance of prophets and messengers in facilitating communication between humanity and the divine. This reinforces the idea that seeking forgiveness and atonement requires humility and obedience to God's instructions, as conveyed through His chosen messengers.

In conclusion, 1 Chronicles 21:18 (KJV) is a verse that conveys important themes of atonement, reconciliation, and the universal nature of God's grace. It illustrates the process of seeking forgiveness and restoration through the act of setting up an altar as a means of atonement and reconciliation. The choice of the threshing floor of Ornan the Jebusite as the location for the altar, and the role of Gad as the messenger, further enriches the symbolism and significance of this verse in conveying the deeper spiritual truths of seeking God's forgiveness and grace.