Exodus 4:13-15 NIV

[13] But Moses said, “Pardon your servant, Lord. Please send someone else.” [14] Then the LORD’s anger burned against Moses and he said, “What about your brother, Aaron the Levite? I know he can speak well. He is already on his way to meet you, and he will be glad to see you. [15] You shall speak to him and put words in his mouth; I will help both of you speak and will teach you what to do.