Shane Idleman emphasizes the multifaceted role of Jesus as King, Priest, and Prophet in his sermon, drawing from Matthew 21. He highlights the significance of Jesus' humble entry into Jerusalem on a donkey, fulfilling the prophecy of Zechariah, and challenges the congregation to submit to His kingship. Idleman stresses the importance of obedience to God's commands and the need for believers to actively serve others, reflecting Christ's compassion. He also discusses the prophetic nature of Jesus' ministry, urging listeners to heed God's voice and live out their faith with humility and love. Ultimately, the sermon calls for a deeper commitment to following Christ and sharing His message with the world.