What does the Bible say about the Lord being king?

In Zechariah 14:9, it is proclaimed that 'the Lord shall be king over all the earth.' This affirmation of God's sovereignty is echoed throughout scripture, revealing that He is the ultimate authority—not just over physical realms, but more importantly, over spiritual ones. Jesus Himself clarified this in John 18:36, stating, 'My kingdom is not of this world.' Therefore, the reign of the Lord transcends earthly kingdoms, pointing to His eternal rule over all creation, established and maintained by His sovereign will.