I haven't been to work for two days, and my boss sent me a short message! Why don't you rest at home! Do not come! What does this mean?

If you don't go to work for two days, the meaning of what the boss said to you is actually obvious, that is, you will be fired. At first, that sentence was quite gentle, letting you have a good rest at home, but the last sentence can basically be concluded that your boss is sending you a notice of resignation, that is, asking you not to come, which means telling you that you are fired by me and I don't want you when you come.