Mark 11:17 (KJV) states, "And he taught, saying unto them, Is it not written, My house shall be called of all nations the house of prayer? but ye have made it a den of thieves."

This verse comes from the New Testament, specifically from the Gospel of Mark, which is one of the four canonical gospels. It recounts the life and teachings of Jesus Christ, and this particular passage describes an incident in the temple in Jerusalem, where Jesus expels the money changers and those who were buying and selling animals for sacrifice.

The context of this verse is important to understanding its meaning. Jesus, having entered Jerusalem triumphantly on a donkey, then goes to the temple. It was here that Jesus found people using the temple as a marketplace, selling animals for sacrifice and exchanging money. He was outraged by this desecration of a sacred place, which should have been a house of prayer and worship.

In this verse, Jesus is quoting from the Old Testament, specifically from the book of Isaiah 56:7. This prophetic passage in Isaiah speaks of a future time when the Lord's house would be a house of prayer for all nations. Jesus’ words here emphasize the purpose of the temple, which is to be a place of prayer and worship for all people, not a place of commerce.

The theme of this verse is the sacredness of the temple and the need for true worship. Jesus is reiterating the importance of the temple as a place where people can come to seek God in prayer and worship. By driving out the money changers, he is showing that the temple should not be used for material gain but for spiritual growth and connection with God.

The symbolism in this verse is also significant. The temple represents the presence of God, and Jesus’ actions in cleansing the temple underscore the need for purity and reverence in approaching Him. The den of thieves symbolizes the corruption and misuse of a holy place for personal gain, which Jesus seeks to rectify.

The broader message of this verse is one of spiritual integrity and devotion. It is a call to prioritize the things of God and to approach Him with sincerity and reverence. This passage serves as a warning against hypocrisy and the distortion of religious institutions for personal gain.

Overall, Mark 11:17 (KJV) contains a powerful message about the sacredness of worship and the importance of maintaining the purity of sacred spaces. It serves as a reminder of the need for sincerity and devotion in approaching God and emphasizes the true purpose of religious institutions as places of prayer and connection with the divine.