The Bible verse Judges 13:21 in the King James Version states, "But the angel of the Lord did no more appear to Manoah and to his wife. Then Manoah knew that he was an angel of the Lord." This verse is a part of the story of the birth of Samson, which is found in the Book of Judges in the Old Testament.

The context of this verse begins with the Israelites once again doing evil in the sight of the Lord, and as a result, the Lord delivers them into the hands of the Philistines for forty years. During this time, a certain man of the tribe of Dan named Manoah and his wife remained childless. One day, the angel of the Lord appears to Manoah's wife and tells her that she will conceive and bear a son. The angel gives her detailed instructions on how to raise the child, including abstaining from certain foods and drink during her pregnancy, as well as keeping the child's hair uncut, as he is to be a Nazirite from birth.

Manoah's wife tells her husband about the encounter with the angel, and Manoah prays to the Lord, asking for the angel to visit them again to give them further instructions on how to raise the child. God hears Manoah's prayer, and the angel of the Lord appears to Manoah while he is in the field. Manoah asks the angel for his name, but the angel replies, "Why askest thou thus after my name, seeing it is secret?" (Judges 13:18). Manoah then offers to prepare a sacrifice for the angel, but the angel tells him to offer it to the Lord.

In the verse Judges 13:21, after the angel of the Lord does not appear again, Manoah realizes that the being they have been speaking with is indeed an angel of the Lord. This moment marks the conclusion of the angel's visit and leaves a lasting impression on Manoah and his wife.

One of the key themes in this passage is the faithfulness and trustworthiness of the Lord. Despite the Israelites' disobedience, God still shows mercy and grace by providing them with a deliverer in the form of Samson. The appearance of the angel of the Lord signifies God's continued involvement and care for His people, even in the midst of their unfaithfulness.

Additionally, the concept of divine intervention and the mysterious nature of God's messengers are evident in this verse. The angel of the Lord is portrayed as a powerful and otherworldly being, and his appearance brings awe and reverence to Manoah and his wife. The angel's enigmatic response to Manoah's questions highlights the unfathomable nature of the divine and emphasizes the need for humility and trust in God's plan.

Furthermore, the symbolism of the angel of the Lord as a bearer of good news and a guide for the future is significant. The angel's announcement of Samson's birth and his instructions for raising the child illustrate God's sovereignty and purpose in bringing about the birth of a mighty deliverer for Israel. The miraculous nature of Samson's conception and the divine mandate for his life set the stage for his future role as a judge and leader of the Israelites.

Overall, Judges 13:21 captures an important moment in the narrative of Samson's birth, emphasizing the divine presence and guidance in the lives of His people. The passage highlights the themes of faithfulness, divine intervention, and the mysterious nature of God's messengers, and it serves as a prelude to the remarkable story of Samson's life and his significant impact on the history of Israel.