Isaiah 37:21 (KJV) states, "Then Isaiah the son of Amoz sent unto Hezekiah, saying, Thus saith the Lord God of Israel, Whereas thou hast prayed to me against Sennacherib king of Assyria."

This verse is part of a larger passage in the book of Isaiah, specifically within a section focusing on the reign of King Hezekiah and his confrontation with the king of Assyria, Sennacherib. In this particular verse, the prophet Isaiah relays a message from the Lord to King Hezekiah regarding his prayers against Sennacherib.

To understand the significance of this verse, it is important to first understand the broader context in which it is situated. In Isaiah 36-37, the Assyrian king Sennacherib launches a military campaign against the kingdom of Judah and besieges the city of Jerusalem. In response to this threat, King Hezekiah seeks the counsel of the prophet Isaiah and prays earnestly to the Lord for deliverance from the Assyrian forces.

In verse 21, Isaiah delivers a message from the Lord to King Hezekiah, affirming that God has heard his prayers against Sennacherib. This reassurance serves as a source of comfort and hope for King Hezekiah in the midst of a dire and seemingly impossible situation. It also serves as a reminder of the power of prayer and the faithfulness of God in the face of adversity.

One of the key themes present in this verse is the sovereignty of God and His ability to intervene in human affairs. Throughout the book of Isaiah, there is a consistent emphasis on God as the supreme ruler and orchestrator of history. The message conveyed to King Hezekiah through Isaiah reaffirms this theme, as it demonstrates God's willingness to respond to the prayers of His people and intervene on their behalf.

Another important theme in this passage is the concept of divine protection and deliverance. King Hezekiah's prayers for deliverance from the Assyrian forces reflect his firm belief in God's ability to rescue and save His people. The message from Isaiah further reinforces this theme, as it serves as a declaration of God's intention to intervene and bring about deliverance for Judah.

The verse also highlights the role of prophets as intermediaries between God and His people. In sending Isaiah to deliver the message to Hezekiah, God demonstrates His use of prophets as vessels through which His will and communication are conveyed to the people. This reinforces the importance of heeding the words of the prophets and acknowledging their role in conveying God's message to His people.

Symbolically, the verse represents a turning point in the narrative, as it marks the beginning of God's intervention in the situation facing Judah. It serves as a reminder of the power of prayer and the faithfulness of God to respond to the cries of His people. Additionally, it symbolizes the assurance of divine protection and deliverance, even in the face of seemingly insurmountable odds.

In conclusion, Isaiah 37:21 (KJV) is a verse that carries profound significance within the larger context of the book of Isaiah. It encompasses themes of God's sovereignty, divine intervention, the power of prayer, and the role of prophets in conveying God's message. It serves as an affirmation of God's willingness to respond to the prayers of His people and bring about deliverance in the midst of adversity. This verse continues to offer encouragement and hope to believers, reminding them of the faithfulness and power of God in their lives.