Who reveals that his supporters will be made of earls in M acbeth?

In Shakespeare's "Macbeth," it is Malcolm who reveals that his supporters will be made up of earls. In Act 4, Scene 3, he discusses the need to rally forces against Macbeth and states that he will gather noblemen, including earls, to reclaim the throne of Scotland. This highlights the noble lineage and the backing of powerful allies in the fight against Macbeth's tyranny.