What does the Bible say about Jesus being the King?

In John 12:12-16, Jesus makes a triumphant entry into Jerusalem, fulfilling the prophecy from Zechariah 9:9, which declares, 'Behold, thy king cometh unto thee, just, and having salvation; lowly, and riding upon an ass.' This event showcases Jesus as the long-awaited King who came to fulfill God's plan of redemption. Throughout the Gospels, His kingship is acknowledged and celebrated, as the people shout 'Hosanna' while welcoming Him. Jesus is not an earthly king but the sovereign ruler who reigns over all and governs His kingdom with justice and mercy.