What two men are arguing at the beginning of scene 5?

At the beginning of Scene 5 in Shakespeare's "Romeo and Juliet," the two men arguing are Sampson and Gregory, who are servants of the Capulet family. They engage in a verbal altercation with Abraham and Balthasar, servants of the Montague family, which escalates tensions between the two feuding families. This confrontation sets the stage for the ongoing conflict throughout the play.