God is addressing Moses' concerns about his speaking abilities by appointing Aaron, Moses' brother, to serve as his spokesperson. Moses had expressed doubt about his ability to communicate effectively, fearing that his speech impediment would hinder his mission. In response, God provides a solution by designating Aaron to speak on Moses' behalf. This arrangement underscores the importance of collaboration and support in achieving divine purposes.
Aaron's role as Moses' mouthpiece illustrates how God equips His servants with the necessary tools and support to accomplish their tasks. It also emphasizes the idea that God often works through human relationships and partnerships to fulfill His plans. By providing Aaron as a helper, God reassures Moses that he is not alone in his mission. This passage serves as a reminder that God understands our weaknesses and provides the means to overcome them, enabling us to carry out His will with confidence and assurance.