Ezekiel 33 is a chapter in a big book called the Bible. The book is all about God and how He wants people to live good and happy lives. In this chapter, God tells a man named Ezekiel to warn people if something bad is going to happen to them.
Imagine your mom telling you not to touch the stove because it's hot and it might hurt you. That's like what God is doing - He's telling people to not do bad things because it will hurt them.
God tells Ezekiel that he is like a watchman who looks out for danger. The watchman has to tell people when danger is coming so they know to protect themselves. In the same way, Ezekiel has to warn people about bad things that are going to happen if they keep doing wrong things.
God wants people to turn away from bad things and turn toward good things. He loves everyone and wants them to be happy, so He sends prophets like Ezekiel to remind people of this.